Alternatives to Dovecot

Compare Dovecot alternatives for your business or organization using the curated list below. SourceForge ranks the best alternatives to Dovecot in 2026. Compare features, ratings, user reviews, pricing, and more from Dovecot competitors and alternatives in order to make an informed decision for your business.

  • 1
    Dovecot Pro

    Dovecot Pro

    Open-Xchange

    Dovecot Pro is a full-service email platform that delivers dynamic scalability, high performance, efficient utilization of hardware, and outstanding support to the world’s largest Telcos, ISP's, and Hosters. With a marketshare of 76% of installed email backends, customers trust the performance of Dovecot Pro. Efficient hardware utilization and advanced monitoring tools for statistics and administration reduce ownership costs and save time and maintenance costs. In addition, Dovecot Pro scales up and out to hundreds of servers and millions of users and multiple physical sites. Its stateless native architecture offers maximum flexibility as each major component can be deployed on its own dedicated node. Dovecot Pro provides industry-leading support for all email standards necessary to provide both Mail Delivery Agent functionality (via LMTP and Sieve), and to facilitate mail retrieval by mail clients (via IMAP and POP3).
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    Cyrus IMAP

    Cyrus IMAP

    The Cyrus Team

    Cyrus IMAP is an email, contacts and calendar server. Cyrus is free and open source. Features: Speed Security Efficiency Search CardDAV and CalDAV support Robust data storage Replication Scalable for large installations Flexible filtering support through Sieve Supports antivirus and antispam toolkits Handles deliverability: SPF, DKIM, DMARC Extensive authentication options, through Cyrus SASL JMAP support Long list of supported standards
    Starting Price: Free
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    Mail-in-a-Box

    Mail-in-a-Box

    Mail-in-a-Box

    Mail-in-a-Box lets you become your own mail service provider in a few easy steps. It’s sort of like making your own gmail, but one you control from top to bottom. Technically, Mail-in-a-Box turns a fresh cloud computer into a working mail server. But you don’t need to be a technology expert to set it up. Each Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software. It also includes contacts and calendar synchronization. The box also includes other standard mail functionality like spam protection (spam filtering and greylisting), mail filter rules, email client autoconfiguration, and automated backups to Amazon S3 and other services. The box also includes automatic DNS configuration when you let it become your nameserver so that it can set important DNS records for mail deliverability and security including SPF, DKIM, DMARC, and MTA-STS. When enabled, DNSSEC (with DANE TLSA) provides a higher level of protection.
    Starting Price: Free
  • 4
    Mailu

    Mailu

    Mailu

    Mailu is a simple yet full-featured mail server as a set of Docker images. It is free software (both as in free beer & as in free speech), open to suggestions and external contributions. The project aims at providing people with an easily setup, easily maintained and full-featured mail server while not shipping proprietary software nor unrelated features often found in popular groupware. Main features include: Standard email server, IMAP and IMAP+, SMTP and Submission with autoconfiguration profiles for clients Advanced email features, aliases, domain aliases, custom routing Web access, multiple Webmails and administration interface User features, aliases, auto-reply, auto-forward, fetched accounts Admin features, global admins, announcements, per-domain delegation, quotas Security, enforced TLS, DANE, MTA-STS, Letsencrypt!, outgoing DKIM, anti-virus scanner, Snuffleupagus, block malicious attachments Antispam, auto-learn, greylisting, DMARC& SPF, anti-spoofing
    Starting Price: Free
  • 5
    Poste.io

    Poste.io

    analogic

    You can have a fully functional mail server installed in a few minutes, mostly waiting for scripts to do the work. The whole package is designed with reasonable defaults to get you up and running quickly, without having to know the internals and without making decisions that could break the email system. User data and configuration is strictly separated from binaries. User database is stored in SQLite database - in file. This makes Poste.io fully compatible with external storage. Migration, backups or updates are therefore very easy and mostly consist of files manipulation. Poste.io has been built from the ground up with security in mind. Internet history is littered with painful security incidents, so we traded old email client compatibility and insecure authentication methods for features that meet today's for features that meet modern security requirements.
    Starting Price: Free
  • 6
    iRedMail

    iRedMail

    iRedMail

    The right way to build your mail server with open source softwares. Works on CentOS Stream, Rocky, Alma, Debian, Ubuntu, FreeBSD, OpenBSD. With iRedMail, you can deploy an OPEN SOURCE, FULLY FLEDGED, FULL-FEATURED mail server in several minutes, for free. We did the heavy lifting of putting all the open source components together and applying best practices. Our product does all the major tasks for you. Furthermore we offer professional support to back you up in case you have some problems. You have all personal data on your own hard disk, you can control the email security, inspect transaction log. No other organization can see the content of all messages. All components used in iRedMail are open source softwares, and you get the bug fixes and updates from the Linux/BSD venders you trust. iRedMail is the right way to build your mail server with open source softwares.
    Starting Price: Free
  • 7
    mailcow

    mailcow

    mailcow

    mailcow: dockerized is an open source groupware/email suite based on Docker. mailcow relies on many well known and long used components, which in combination result in an all around carefree email server. Each container represents a single application, connected in a bridged network.
    Starting Price: Free
  • 8
    qmail

    qmail

    qmail

    qmail is a secure, reliable, efficient, simple message transfer agent. Security isn't just a goal, but an absolute requirement. Mail delivery is critical for users; it cannot be turned off, so it must be completely secure. qmail's straight-paper-path philosophy guarantees that a message once accepted into the system, will never be lost. qmail also optionally supports maildir, a new, super-reliable user mailbox format. Maildirs, unlike mbox files and mh folders, won't be corrupted if the system crashes during delivery. Even better, not only can a user safely read his mail over NFS, but any number of NFS clients can deliver mail to him at the same time. qmail is vastly smaller than any other Internet MTA. Other MTAs have separate forwarding, aliasing, and mailing list mechanisms. qmail has one simple forwarding mechanism that lets users handle their own mailing lists.
  • 9
    Apache James

    Apache James

    The Apache Software Foundation

    James stands for Java Apache Mail Enterprise Server. It has a modular architecture based on a rich set of modern and efficient components which provides at the end complete, stable, secure, and extendable Mail Servers running on the JVM. Create your own personal solution of email treatment by assembling the components you need thanks to the Inversion of Control mail platform offered and go further customizing filtering and routing rules using James Mailet Container. The Apache James project wires together the different libraries composing James to provide running services, ready to download on the Apache mirrors.
    Starting Price: Free
  • 10
    Hermes SEG

    Hermes SEG

    Black Fish Networks LLC

    Hermes SEG is a free, open-source secure email gateway and server. It delivers spam, virus, and malware protection using SpamAssassin, ClamAV, and Amavisd-new, along with full encryption in transit and at rest via SMTP TLS, S/MIME, PGP, encrypted PDF (CipherMail), and Dovecot mail-crypt. It includes email archiving and integrated mailbox hosting with quotas, aliases, shared folders, Sieve rules, vacation replies, and mobile auto-configuration. Collaboration features come through Nextcloud (webmail, file sync, calendars, contacts). Identity and access are managed with OpenLDAP and Authelia, supporting SSO and MFA (TOTP, WebAuthn, Duo). It also enforces modern authentication standards: SPF, DKIM, DMARC, and ARC.
    Starting Price: $0/month/user
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    Haraka

    Haraka

    Haraka

    Haraka can serve thousands of concurrent connections and deliver thousands of messages per second. Haraka and plugins are written in asynchronous JS and are very fast. Haraka has very good spam protection (see plugins) and works well as a filtering MTA. It also works well as an MSA running on port 587 with auth and dkim_sign plugins enabled. Haraka makes no attempt to be a mail store (like an exchange or postfix/exim/qmail), an LDA, or an IMAP server (like Dovecot or courier). Haraka is typically used with such systems. Haraka has a scalable outbound mail delivery engine built in. Mail marked as relaying (such as via an auth plugin) is automatically queued for outbound delivery. Haraka's plugin architecture provides an easily extensible MTA that complements traditional MTAs that excel at managing mail stores but do not have sufficient filtering.
    Starting Price: Free
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    Hestia Control Panel

    Hestia Control Panel

    Hestia Control Panel

    Hestia Control Panel is an open source, lightweight, and powerful server management solution offering a web and CLI interface to deploy and manage web domains, mail, DNS, databases, and backups from a single dashboard. It supports SFTP/SSH user access with chroot jails, two‑factor authentication, SSH key management, and per‑domain TLS certificates. Multiple PHP versions, Nginx, MariaDB/MySQL, PostgreSQL, Exim/Dovecot mail services, and DNS with DNSSEC are all integrated. One‑click CMS installation and interactive GUI for backups, including automated backups to FTP, SFTP, or over 50 cloud providers, simplifies operations. The control panel also includes automated firewall rules, quota management, and robust REST API support. Hestia is made with ease of use in mind, creating a user or a website is as easy as clicking a button and filling out a couple of fields, while advanced features are easily accessible.
    Starting Price: Free
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    Zentyal

    Zentyal

    Zentyal

    Join Windows® clients to the domain and manage them transparently. No disruption to your users, no user or device CALs. Comes with industry-standard SMTP and POP3/IMAP mail server built upon the most established technologies and protocols. Guarantees reliable and secure Internet access and helps to manage all the basic network infrastructure services. Receive software updates until the EOL-date of each version and get support when needed. Zentyal offers an easy to use Windows Server® alternative. It comes with native compatibility with Microsoft Active Directory® allowing you to join Windows® clients to the domain and manage them easily, causing no disruption to your users. Zentyal includes the industry-standard SMTP and POP3/IMAP mail servers built upon the most established technologies and protocols. Gives you the opportunity to deploy Zentyal as a mail server, domain & directory server with mail or all-in one server.
    Starting Price: €195 per server
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    Courier

    Courier

    Double Precision, Inc.

    The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols, such as ESMTP, IMAP, POP3, LDAP, SSL, and HTTP. Courier provides ESMTP, IMAP, POP3, webmail, and mailing list services within a single, consistent, framework. Individual components can be enabled or disabled at will. The Courier mail server now implements basic web-based calendaring and scheduling services integrated in the webmail module. Advanced groupware calendaring services will follow soon. The Courier mail server's source code should compile on most POSIX-based operating systems based on Linux, and BSD-derived kernels. The Courier mail server should also compile on Solaris and AIX, with some help from Sun's or IBM's freeware add-on tools for their respective operating systems. The Courier mail server evolved out of several related projects, that merged together (more on that later). The Courier mail server implements SMTP extensions for mailing list management.
    Starting Price: Free
  • 15
    hMailServer

    hMailServer

    hMailServer

    hMailServer is a free, open source, e-mail server for Microsoft Windows. It's used by Internet service providers, companies, governments, schools and enthusiasts in all parts of the world. It supports the common e-mail protocols (IMAP, SMTP and POP3) and can easily be integrated with many existing web mail systems. It has flexible score-based spam protection and can attach to your virus scanner to scan all incoming and outgoing email.
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    MailEnable

    MailEnable

    MailEnable

    MailEnable provides an end to end solution for providing secure email and collaboration services. A recent independent survey reports MailEnable as the most popular Windows Mail Server Platform in the world. Whether you are a hosting company providing email services to thousands of end users or a small business with a single domain, MailEnable provides a solution that will impress your mail users. MailEnable provides Windows Mail Server software with features comparable to Microsoft Exchange. It provides powerful messaging services like Exchange ActiveSync, IMAP, SMTP, POP3 and collaboration tools such as calendaring (CalDAV), contacts (CardDAV), tasks and notes.
    Starting Price: $349
  • 17
    Mercury Mail Transport System
    Mail from the outside world is received by Mercury and placed in the addressee's mailbox, where the user can access it at any later point. Messages sent by local users to the outside world are passed to Mercury, which then takes whatever steps are necessary to deliver them, removing the burden from the user's workstation and allowing him to continue with other work. If you connect using a dialup connection, then only the mail server needs to be able to access that connection. Your workstations do not need their own modems or Internet accounts. The mail server can continue processing mail even when the client workstations are turned off, allowing functions that depend on a continuously available service, such as automatic replies and auto-forwarding.
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    eSoftTools IMAP Backup & Migration Software
    eSoftTools IMAP Backup and Migration Software is a professionally advanced and powerful IMAP email backup tool that helps users securely back up, download, or migrate emails from any IMAP-supported account. With its simple graphical interface, it becomes a user-friendly application to adopt and use for IMAP email backup and migration in more than 15+ file formats and popular cloud email platforms like Office 365, Gmail, Google Workspace, Yahoo Mail, and other IMAP server accounts. This tool is proudly supports all major IMAP servers for email backup, including Gmail, Google Workspace, Yahoo Mail, Outlook.com, Office 365, AOL, Zoho Mail, GoDaddy, Hostinger, HostMonster, iPage, BlueHost, MochaHost, and all other hosting-provided company email systems. The software is fully capable to download entire mailbox or any specific date range of emails with fast scanning and secure process. Users can export emails including Outlook PST, EML, EMLX, MSG, MBOX, Lotus Notes NSF, HTML, and more.
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    Modoboa

    Modoboa

    Modoboa

    Regain your independence and protect your privacy by installing your own email server. It takes less than 10 minutes! Create your mail server for free in less than 10 minutes with Modoboa When it comes to create a mailbox, you generally have several solutions: - Use the services offered by Internet providers (Orange, Vodafone...) of infrastructure providers (OVH, Gandi...) with a monthly or annual subscription. However, customization and configuration possibilities, domains and mailboxes number are limited. - Use the services of free email providers (Gmail, Live, Yahoo...) which are limited and your data is used for commercial purposes. - Install your own email server, which requires important technical knowledge to setup and configure the system. Modoboa is an alternative to those 3 options. It frees you from dependence on email providers and makes accessible to all the creation his own secure email server. The whole thing, in less than 10 minutes and freely.
    Starting Price: Free
  • 20
    MDaemon Email Server

    MDaemon Email Server

    MDaemon Technologies

    The MDaemon Email Server was one of the first Microsoft Exchange alternatives offered to businesses around the world. It has been developed with the ongoing input from IT professionals seeking an easy-to-use, reliable, and secure mail server that does not require expensive administration or impose high per-user costs. It simplifies messaging and collaboration with a focus on security and privacy, an intuitive, user-friendly web mail design and by offering administrators Mobile Device Management, Business Instant Messaging, Document Sharing, and other enterprise-class features that can be managed with minimal support. MDaemon Email Server supports IMAP, SMTP, and POP3 protocols, and features include: integrated webmail with IM and document sharing, Outlook support, compromised password alerts, color-coded log files for quick and easy troubleshooting, customizable email policy setting to fit your unique network environment, Mobile Device Management, Account Hijack Detection, and more.
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    Starting Price: $360 per year
  • 21
    Trojitá
    Trojitá is an email program ("client") specialized in giving fast and efficient access to mailboxes over the IMAP protocol. An IMAP mail server stores messages and allows clients to fetch messages to the local computer when asked for. It prioritizes efficiency, speed and open standards above other goals. Trojitá also aims to be multi-platform, and functions well on everything from big desktop computers to small cellphones. Trojitá is a stand-alone program, not part of a "personal information manager" suite.
  • 22
    Hexamail POP3 Downloader
    POP3 Downloader is a high-performance, scalable, real-time POP3 connector for your mail server. It supports downloading and forwarding any POP3 or IMAP account email to any email server that supports SMTP or IMAP. Key Features: 100% Compatibility with all versions of Exchange 100% Compatibility with all SMTP servers End-user management via a web interface Antivirus and Antispam options IMAP Support (with folders) IMAP Push Support Gmail Support 1-minute scheduling No email size limits Microsoft Exchange integration without the need for a public SMTP server or static IP address Migrate or integrate unlimited external POP3 or IMAP email accounts into local mailboxes Continue receiving mail from legacy accounts during migration to a new mail server IMAP migration or IMAP sync between two IMAP servers Reliable, easy to install, and cost-effective solution Streamline your email integration processes and automate email downloads with Hexamail POP3 Downloader.
    Starting Price: $114/10 users
  • 23
    MacMister MBOX Converter
    MacMister MBOX Converter for Mac is an advance powerful solution to batch export Mac MBOX mailboxes to PST, MSG, PDF, EML, IMAP, Outlook.com and more. Mac MBOX Converter carries simple and effective steps so that any technical and non-technical users can use the solution and instantly perform the conversion without data loss. MacMister MBOX Converter equipped with features such as filters, naming option, create separate PST for each MBOX, dual options to add MBOX files and more. MBOX Migrator for Mac equipped with free demo that enables to transfer 25 MBOX files free of cost.
    Starting Price: $29 one-time payment
  • 24
    Aryson Office 365 Backup & Restore
    Aryson Office 365 Backup & Restore is a risk-free & reliable Office 365 Backup utility that allows you to take the backup of Office 365 mailboxes into various file formats. It takes backup of Office 365 mailboxes into PST, MBOX, PDF, EML, EMLX, MSG, and other file formats on your local system or pc. It also restores mailboxes of PST/OST files into the Office 365 account. Aryson Office 365 Email Backup Tool is the top utility that allows users to back up or migrate Office mailboxes to various file formats and email clients. Using this software, users can backup and migrate Office 365 mailboxes to PST, PDF, MSG, MBOX, Gmail, Yahoo, GoDaddy email, Yandex, Amazon Webmail, IMAP, etc. Sometimes, Office 365 users search for a quick solution that helps to download all emails from Office 365 accounts. Considering the users’ search, Aryson Office 365 Email backup tool allows users to download all emails from office 365 to any storage device in many formats such as PST, MSG, EML, MBOX, etc.
    Starting Price: $99 one-time payment
  • 25
    Cigati Office 365 Email Backup Tool
    Office 365 Email Backup Tool is a prominent solution to backup and migrate Office 365 email data, including all the attachments. It can effectively save your Office 365 mailbox in MSG, JSON, HTML, EML, PST, DOCX, etc. You can also shift the Office 365 mailbox to various email clients such as Gmail, Yahoo Mail, Thunderbird, IMAP, Hotmail, etc. Moreover, the tool also allows restoring the OST and PST files into the Office 365 account. The cloud storage of Office 365 gets jammed due to excessive emails and less storage. This powerful utility exports Office 365 emails to Outlook, freeing up the server space on the cloud. It includes all the mailbox items and attachments in the migration along with the emails. Cigati Office 365 Backup Tool saves mailbox data from Office 365 account to different file formats like PST, JSON, MSG, PDF, DOCM, MHTML, TXT, EML, MBOX, and so on. The users can utilize this backup to access the data in times of data crisis.
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    Horde

    Horde

    Horde

    Horde is the most flexible groupware on the planet, and that makes it the perfect platform on which to build your business productivity software. Horde connects to (and officially supports) more backends (all the leading SQL, LDAP, IMAP, Sieve, SMTP, cache platforms available today) than any other open source groupware system. This means you can continue to use your existing userbase and your users do not have to remember any additional passwords. Horde's feature set rivals the largest enterprise email systems. We have an incredible feature set that compares favorably against any competition in our primary apps (mail, calendar, address book), and even more in our secondary apps (time tracking, wiki, ticketing, and more).
    Starting Price: Free
  • 27
    CubexSoft MDaemon Converter

    CubexSoft MDaemon Converter

    CubexSoft Technologies

    CubexSoft MDaemon Converter is an All-rounder MDaemon export solution to export MDaemon mailboxes to PST, PDF, EML, MSG, MBOX, HTML, DOC, Office 365, Exchange, Outlook.com, Gmail, IMAP Server etc. Tool supports to convert complete MDaemon user account data including emails, contacts, calendars, notes, tasks etc. to multiple options. MDaemon Converter is designed to migrate single as well as unlimited MDaemon mailboxes in batch mode. Its simple GUI is helpful for technical and non-technical users. You can even use its advance filters to move only desired MDaemon item. Download Free demo edition of the MDaemon Converter and check its working efficiency by converting first 25 items per MDaemon folder, without any charges.
    Starting Price: $69
  • 28
    MacSonik Gmail Backup Tool
    Gmail Backup Tool for Mac is a perfect utility that effortlessly creates the backup of Gmail mailboxes and saves it to a different format like PST, PDF, MBOX, MSG on macOS. Even the application directly import Gmail emails to Office 365, Yahoo Mail, Hotmail, IMAP, etc. It allows users to backup the emails from the Gmail account on MAC OS X. Import Gmail emails to Yahoo, Thunderbird, Amazon Webmail, Icloud, Zoho Mail, etc. Option to set up a backup schedule of Gmail emails. It privileges a feature to free up the server space after the backup of emails. The maximum number of users are looking for a solution to backup their complete Gmail mailboxes in PST formats on a mockup of their MacOS. Here, Gmail Backup Tool for Mac is a top-rated application that helps users mail mailboxes in PST format. Gmail Backup Tool for Mac allows users to import their emails from Gmail to another Gmail account without losing a single piece of data.
    Starting Price: $49 one-time payment
  • 29
    Spam Arrest

    Spam Arrest

    Spam Arrest

    Before using Spam Arrest, over 90% of our customers tried a spam filter on their inbox, yet spam still got through. Spam Arrest protects your mailbox from 100% of spam with a patented method for verifying relationships between you and your valued contacts, making email safe for everyone. Access your email using your favorite POP3/IMAP-compatible program (such as Outlook or Eudora), or from anywhere using our powerful webmail system. Get a new email address, as well as protect your existing mailboxes. Patented challenge, response technology blocks 100% of automated spam. Webmail allows you to access your email from any web browser, without having to install any additional software. SMTP is a standard protocol used for sending email. When you send email through the Spam Arrest SMTP server or webmail, the person you are sending email to is automatically added to your whitelist, so that they can reply to you without having to complete the verification process.
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    Kerio Connect
    Secure, enterprise-style email, calendar & collaboration without the high cost. Kerio Connect delivers all the features and functionality for collaboration and messaging solution without the complexity and high price tag of other systems. Email is integrated with shared calendars and scheduling, contacts management, tasks, notes, shared and public folders, and instant messaging. Synchronize messages by direct push to your choice of mobile device via Microsoft ActiveSync. Instant Messaging is XMPP-compatible and can be used from various 3rd party chat/IM applications on desktop and mobile phones. You can install Kerio Connect in 10 minutes and users can be up and running in just 10 minutes more. Kerio Connect can be deployed on-premises or in partner-hosted cloud environments. Deploy for users on Mac, Windows, or Linux; plus full support for Outlook (Windows and Mac) and many other IMAP or POP compliant email clients.
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    Oracle Communications Messaging Server
    Oracle Communications Messaging Server is a standards-based Internet messaging server designed for high-capacity, reliable message handling for service providers and their customers. Messaging Server provides support for several email protocols and can manage embedded text, sound, graphics, video files, and other files and formats.
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    EdbMails

    EdbMails

    EdbMails

    EdbMails is an all-in-one recovery and migration software supporting EDB to PST conversion, Exchange migration from offline EDB, Live Exchange server migration, Office 365 migration, IMAP migration, OST and PST recovery. EdbMails is a powerful software solution designed for Exchange Server and Office 365 migrations, EDB to PST conversions, and mailbox recovery. It allows businesses to recover data from corrupted or offline Exchange EDB files, seamlessly convert mailboxes to PST files, and migrate mailboxes to Exchange or Office 365. The platform offers a user-friendly interface, fast and secure migrations, and the ability to perform incremental migrations to avoid duplication. EdbMails also supports public folder and archive mailbox migrations, ensuring businesses can transfer all their data without downtime or data loss.
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    OpenText MailStore Cloud Archive
    OpenText MailStore Cloud Archive is a cloud-native, SaaS-based email-archiving solution designed for small and medium-sized businesses. It supports virtually all common email systems, including Microsoft 365 (Exchange Online), on-premises Microsoft Exchange Server, Google Workspace, as well as generic IMAP and POP3 servers, and can archive single or multiple mailboxes, including shared or group mailboxes. It offers complete archiving through journaling (capturing emails before delivery) or mailbox synchronization (including folder structure), with deduplication, support for IRM-protected messages, non-delivery reports, and the option to remove archived messages from the live mailboxes. All archived emails are stored in a tamper-proof manner: they remain authentic copies identical to the originals, protected with strong encryption, digital signatures, and legally compliant audit logging.
    Starting Price: $259 per year
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    HEAL Software

    HEAL Software

    HEAL Software

    The complete self-healing IT solution for your enterprise. Thanks to its unique cognitive capabilities, HEAL prevents IT system failures before they even happen, letting you focus your time and energy on other aspects of your business. In a fast paced world where every second counts, it’s no longer good enough to detect and flag incidents after they have happened. A self-healing solution that predicts and prevents rather than just fix what’s broken, HEAL is a new age IT tool that uses AI algorithms and machine learning models to help enterprises run without a hitch. Using a patented technique called ‘workload-behavior correlation’, HEAL analyses all the aspects that go into the smooth running of an IT system (the cumulative volume, composition and payload), and reacts every time an abnormal behavior occurs, triggering either a healing action or a scaling action depending on the root cause of the problem.
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    SOGo

    SOGo

    SOGo

    SOGo is a fully supported and trusted groupware server with a focus on scalability and open standards. SOGo is released under the GNU GPL/LGPL v2 and above. SOGo provides a rich AJAX-based Web interface and supports multiple native clients through the use of standard protocols such as CalDAV, CardDAV and GroupDAV, as well as Microsoft ActiveSync. SOGo is the missing component of your infrastructure; it sits in the middle of your servers to offer your users a uniform and complete interface to access their information. It has been deployed in production environments where thousands of users are involved.
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    DRS Softech IMAP Migration Tool
    DRS Softech IMAP Migration Tool is a single-step solution to migrate your IMAP-enabled accounts Such as Gmail, G Suite, Office 365, and other IMAP-enabled accounts with complete accuracy. It can back up the IMAP mailbox locally in the PST, EML, MSG, and PDF. It can remove duplicate emails also. You can Migrate Calendar from IMAP to Office 365 with the help of this tool. This application provides you all the advanced features with a working demonstration to make email migration secure and precise. Built with interactive GUI, the IMAP Backup Tool is easy to use for all users. Along with that, this software is available for both Windows and Mac OS. The free version and Technical support are also available.
    Starting Price: $79
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    Eudora Internet Mail Server

    Eudora Internet Mail Server

    Eudora Internet Mail Server

    Completely rewritten relay restrictions with an easier to use interface that gives finer control over relay security. New domain name resolver (DNR), EIMS now has it's own DNR, which works around bugs in the Open Transport DNR and performance problems with the OS X DNR. The new DNR does not currently support non-recursive DNSs. SMTP Submit port, this is a second SMTP port running on TCP port 587 by default. It currently works exactly the same as the standard SMTP port. This is handy for clients that are stuck behind an ISP that blocks port 25 access. Sending Setup option for maximum recipients per message. Expand SMTP Addresses option, you can now turn this off, with EIMS 3.1 and earlier it was always on. The SMTP server (both port 25 and 587) now reports Telnet connections and connections that look like port scans (connections where no data is sent and it doesn't time out).
    Starting Price: Free
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    WinGate

    WinGate

    WinGate

    WinGate Proxy Server is a highly capable HTTP Proxy server, SOCKS server, integrated Internet gateway and communications server designed to meet the access control, security and communications needs of today's businesses. In addition to a comprehensive range of features, WinGate Proxy Server's license options provide you the flexibility to match your needs to your budget, whether you need to manage an enterprise, small business, or home network. WinGate Proxy Server will share most types of Internet connection, allowing multiple users to simultaneously surf the web, retrieve their email, or use other internet programs, as if they were directly connected to the Internet. Whether it is a simple dialup modem or high speed fibre, WinGate Proxy Server can help to make the most out of the connection. WinGate Proxy Server supports a wide variety of Internet protocols, allowing applications such as Web browsers, messaging software, FTP and SSL.
    Starting Price: $109.95 one-time payment
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    CommuniGate Pro

    CommuniGate Pro

    CommuniGate Software

    Our end to end Unified Communications technology begins with the platform CommuniGate Pro. The system enables large scale Unified Communications with open API’s for integration into business applications. CommuniGate Pro scales dynamically to 100’s of millions of accounts. Ideally suitable for “Nation” scale alert systems, multimodal communications within web applications, or compartmentalized high-security network topologies. However, big scale does not mean trade-offs on efficiency or reliability. The platform is extremely agile for resilient applications in military or embedded environments. CommuniGate Pro is approved for governmental agency use in Europe and in the USA. Military, transportation and research center use is legendary for mind bending stability with uptimes like VMS. CommuniGate Pro enables banks to deploy mail to millions of clients for online self care while respecting compliance regulations. The signaling features of the server can be deployed in a hybrid system.
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    4n6 Office 365 Backup Tool
    4n6 Office 365 email backup software is an advanced utility for backing up Office 365 shared, primary, and in-place archive mailboxes to multiple email file formats, document file formats, IMAP email accounts, and desktop email services. This software is also available in the demo version, user can take a backup of 10 office 365 emails in the folders of each mailbox. Users can preview their Office 365 mailbox data before the backup process and select the specific folder they want to back up from their Office 365 mailboxes.
    Starting Price: $49
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    MBOX to Office 365 Migration

    MBOX to Office 365 Migration

    Mails Daddy Software

    Our MailsDaddy MBOX to Office 365 is an email migration solution that imports multiple MBOX files into Office 365 Primary, Shared, In-Place Archive and, Group mailboxes. Effortlessly upload emails and attachments from .mbox files into your Office 365 or Live Exchange Server. The software allows adding MBOX file manually, browsing a folder where MBOX files are stored and searching MBOX files from a pointed location. The MBOX to Office 365 Migration Tool is developed with an advanced algorithm that performs the MBOX to Office 365 Migration with an ease. The MBOX to Office 365 converter preserves the original folder names as well as folder structure even after migration into Office 365 mailbox. If you don't want to move all e-mails of MBOX files to Office 365 then you can select required messages and click on the Export button to migrate them.
    Starting Price: $99 one-time payment
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    OpenSMTPD

    OpenSMTPD

    OpenSMTPD

    OpenSMTPD is a free implementation of the server-side SMTP protocol as defined by RFC 5321, with some additional standard extensions. It allows ordinary machines to exchange emails with other systems speaking the SMTP protocol. Started out of dissatisfaction with other implementations, OpenSMTPD is a fairly complete SMTP implementation. OpenSMTPD is primarily developed by Gilles Chehade and Eric Faurot, with contributions from various OpenBSD hackers and members from other communities.
    Starting Price: Free
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    ClearOS

    ClearOS

    ClearCenter

    Applications and an operating system come with your computer, tablet, and phone. So, why not on your server? HPE is redefining the small business server by offering ClearOS with HPE ProLiant servers. ClearOS is a simple, open, and affordable operating system with an intuitive graphical web-based user interface and an application marketplace with over 100 apps to choose from, with more being added every day. Leveraging open source software, you decide what applications you need and only pay for the applications and support you want. HPE and ClearCenter are making it easy for small, home, remote, and branch offices to have a server ready to use, out of the box, at no additional cost. HPE ProLiant integrated with ClearOS offers a simple, affordable, and secure experience. Building the IT solution that is just right for you has never been easier.
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    Mutant Mail
    Never miss an important email again! Manage all your email IDs in one inbox with our Email Router. Struggling with multiple Emails? Overcome the headache of managing multiple Email ids with our privacy-focused, server-side solution Mutant Mail. Problem: Imagine having 5 domains, with 5 Email IDs each (admin, support, help, legal, contact). That's 25 Email IDs. Do we want to log in to every mailbox to keep the domain persona? Answer: Receive, Reply & Send all Emails for your Domains from your free Gmail account(or any Email account) and save on Email Hosting. Skip the Email client setup headache! Forget about Credentials, SMTP, IMAP/POP for every Email id with Mutant Mail. With Mutant Mail service you can receive, send and reply all using one mailbox. Spoof-proof your Emails with complimentary DMARC Report. PGP/GPG encryption. Buffer / Batch your emails.
    Starting Price: $2.99 per month
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    MailSite Fusion

    MailSite Fusion

    Rockliffe Systems

    MailSite Fusion is a Windows email, calendar and contact server with over-the-air push to all types of smartphones, Full native Outlook sync, a sophisticated AJAX web client and a calendar and contact sharing server, which can synchronize and publish to many other clients. MailSite has been voted in the top 3 mail server products by readers of Windows IT Pro Magazine 3 years running. Your email services are critical to your organization. So you need to be sure that you select a quality product, from a company with a proven track record in communication software. So, why this mail server? Because Rockliffe understands your concerns, we have been specializing in developing and refining our email server and email security software for business and service providers since 1995. Built from the ground up to be fast, stable and secure, MailSite Fusion is ready to meet the needs and requirements that matter to you most.
    Starting Price: $90 per year
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    Kolab Now

    Kolab Now

    Apheleia IT AG

    Secure and private email, calendars and more. 100% Free & Open Source Software (FOSS). Open standards and formats used for all storage and communication. No vendor lock-in. All data stored under Swiss jurisdiction. User data never transmitted to any third party without explicit consent. GDPR, HIPAA and PCI compliant. Built secure from the ground up. Supports perfect forward secrecy (PFS). End-to-end encryption available. No back doors. Our documentation contains answers to most frequently asked questions and much more. Are you looking for an instant answer to your question or a quick solution for your problem, our Knowledgebase is where you will likely find it. If you can’t find the answer in our documentation, you can always contact support.
    Starting Price: $9.90 per month
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    OpenText Core Email Continuity​
    The OpenText Core Email Continuity solution ensures continuous access to email even when your primary mail infrastructure goes down, by automatically redirecting messaging to a secure web portal or Outlook via POP/IMAP, allowing users to read, reply, forward, compose, and send email normally during outages. It provides up to 30 days of stored inbound messages, preserving recent email history. During a mail-server outage, incoming messages are spooled at the spam filter, and users are automatically directed to the continuity service; once the primary server returns online, all email activity (sent items, replies, forwards, new messages) syncs back automatically to the main mailbox, preserving continuity. It requires no additional hardware, it auto-provisions through a central portal, and runs transparently until needed. Access can be from any device, anywhere, via web or standard email clients.
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    MailsSoftware OST to PST Converter
    MailsSoftware OST to PST converter is a trustworthy solution to repair corrupted OST file data and export Outlook OST to PST, EML, MSG, and MBOX file format. An Outlook is world’s best email desktop client to send and receive the emails, calendars, task, contacts in OST and PST file format. An OST file creates when the email account is configured with MS Exchange server and cache exchange mode is checked. The OST file stores complete mailbox data in structured format. Sometime the OST file becomes unreachable or unable to open due to any reason like Virus Attack, Hardware problems, Modification in MAPI address or Exchange server crashed down etc. Then there is not any method to open and view OST file mailbox data. You have to get third-party software to make OST file readable. Download MailsSoftware OST to PST tool to recover highly corrupted Outlook OST file data along with complete mailbox data.
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    Cigati Mail Migration Tool
    Cigati Mail Migration Tool is a stand-alone utility with an interactive user interface that is compatible with technical and non-technical users. It is suitable for all the versions of the Windows operating system. This advanced utility facilitates users to backup and migrates all the mailbox data of various email clients into different file formats and email clients. It also allows users to backup and migrate various file formats into various docs, images, and mailbox formats. With the help of this utility, you can import Yahoo Mailboxes to Gmail, Office 365, Thunderbird, IMAP, and other webmail email clients. You can also backup them into PDF, PST, EML, DOC, JSON, PNG, HTML, CSV, etc. This Mail Migration Tool facilitates users to perform multiple useful tasks like export Office 365 mailboxes to PST, backup Gmail emails to PDF, import PST to Office 365, export OST to PST, convert MSG to PDF, etc.
    Starting Price: $399 one-time payment
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    OST to Office 365 Migration

    OST to Office 365 Migration

    Mails Daddy Software

    A simple solution for migrating OST files to Office 365 mailbox. The Application uploads entire OST data including emails, attachments, contacts & calendar items, etc. to o365 Primary, In-Place Archive, or Shared Mailboxes. Effortlessly recover and convert OST to Exchange Online. Upload Emails, Attachments, Contacts, Calendars & Tasks etc. to o365. One-click app to Convert & Move OST file to Office 365 cloud platform. Migrate selected emails/folders from OST file to Exchange Online. Show preview of OST file data & attachments prior to importing to O365. OST to Office 365 migrator keeps folder hierarchy & HTML formatting. Compatible with all Windows OS like Windows 10, 8.1 , 7, Vista, & XP etc. Convert Exchange server, IMAP & Hotmail OST files to Office 365 OWA. Import OST files to Office 365 mailboxes with impersonation.(Applicable on Business and Enterprise License). Insert the OST file using plus sign after clicking on the Add File option.
    Starting Price: $99 one-time payment