Post-Office Software for Linux

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Browse free open source Post-Office software and projects for Linux below. Use the toggles on the left to filter open source Post-Office software by OS, license, language, programming language, and project status.

  • Top-Rated Free CRM Software Icon
    Top-Rated Free CRM Software

    216,000+ customers in over 135 countries grow their businesses with HubSpot

    HubSpot is an AI-powered customer platform with all the software, integrations, and resources you need to connect your marketing, sales, and customer service. HubSpot's connected platform enables you to grow your business faster by focusing on what matters most: your customers.
  • Free and Open Source HR Software Icon
    Free and Open Source HR Software

    OrangeHRM provides a world-class HRIS experience and offers everything you and your team need to be that HR hero you know that you are.

    Give your HR team the tools they need to streamline administrative tasks, support employees, and make informed decisions with the OrangeHRM free and open source HR software.
  • 1
    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, calendaring, and mailing list services.
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    Downloads: 353 This Week
    Last Update:
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  • 2
    SwithMail
    Send SMTP email silently from command line (CLI), or a batch file using Exchange, Gmail, Hotmail, or Yahoo! Plus. Supports XML settings files, variables, or all settings explicitly from the command line. Now supporting Exit Codes for batch file use (will return "0" for successful delivery, or "1" for error delivering) - handle your batch file accordingly.
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    Downloads: 56 This Week
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  • 3
    Fetchmail - the mail-retrieval daemon

    Fetchmail - the mail-retrieval daemon

    Client daemon to move mail from POP and IMAP to your local computer

    Fetchmail is a mail retrieval daemon that can download messages from POP3, IMAP, ODMR and ETRN-based stores, with SSL/TLS security including certificate verification, and pass downloaded mail to a local SMTP or LMTP server, or a message delivery agent such as maildrop.
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    Downloads: 151 This Week
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  • 4

    Isync

    mailbox synchronizer

    A command line utility for synchronizing remote IMAP mailboxes and local maildir-style mailboxes. This is useful for working in disconnected (off-line) mode, such as on a laptop, but also for mirroring mailboxes between servers.
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    Downloads: 99 This Week
    Last Update:
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  • Precoro helps companies spend smarter Icon
    Precoro helps companies spend smarter

    Fully Automated Process in One Tool: From Purchase Orders to Budget Control and Reporting.

    For minor company expenses, you might utilize a spend management solution or track everything in spreadsheets. For everything more, you'll need Precoro. We help companies achieve procurement excellence and budget efficiency by building transparent, predictable, automated spending workflows.
  • 5
    ZMail allows you to send email from anyone, to anyone. You can use ZMail to send fake or anonymous emails. Have fun!
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    Downloads: 44 This Week
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  • 6
    OpenPop.NET

    OpenPop.NET

    Robust open source POP3 client and MIME parser written in C#

    .NET library written in C# with a full implementation of a POP3 client. Easy to use but yet powerful. Includes a robust MIME parser backed by several hundred test cases. The easiest way to install OpenPop.NET is via NuGet. In Visual Studio's Package Manager Console, simply enter the following command: Install-Package OpenPop.NET Our homepage (http://hpop.sourceforge.net/) includes examples, documentation and a general introduction for email. For more information, visit our project homepage. Code is hosted on GitHub (https://github.com/foens/hpop).
    Downloads: 12 This Week
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  • 7
    IndiMail
    Highly scalable/configurable Messaging Platform allowing users in a domain to be distributed on multiple hosts, has multiple queues. Provides virtual domains/users in MySQL. Modern MSP class qmail replacement with ESMTP, POP3/IMAP, QMTP, QMQP support
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    Downloads: 11 This Week
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  • 8
    Convert Webmail to POP3.Is also included a SMTP/POP3 tunneling system that allow send and receive email in a private network HTTP PROXY based. All connection are plugin based. Over 450 email server supported and tested, GMAIL POP3/SMTP over Proxy Network.
    Downloads: 5 This Week
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  • 9
    FreePOPs is a webmail to pop3 conversion daemon. It is extensible to support other webmail using the scripting language LUA. See the homepage for supported webmails.
    Downloads: 4 This Week
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  • Holistically view your business data within a single solution. Icon
    Holistically view your business data within a single solution.

    For IT service providers and MSPs that need a data platform to manage their processes

    BrightGauge, a ConnectWise solution, was started in 2011 to fill a missing need in the small-to-medium IT Services industry: a better way to manage data and provide the value of work to clients. BrightGauge Software allows you to display all of your important business metrics in one place through the use of gauges, dashboards, and client reports. Used by more than 1,800 companies worldwide, BrightGauge integrates with popular business solutions on the market, like ConnectWise, Continuum, Webroot, QuickBooks, Datto, IT Glue, Zendesk, Harvest, Smileback, and so many more. Dig deeper into your data by adding, subtracting, multiplying, and dividing one metric against another. BrightGauge automatically computes these formulas for you. Want to show your prospects how quick you are to respond to tickets? Show off your data with embeddable gauges on public sites.
  • 10
    jwSMTP, Send email programmatically (C++ code/lib). Linux, BSD, Windows etc. Attachments, Multiple recipients, Cc/Bcc recipients supported. MX lookup or send to an SMTP server direct. LOGIN and PLAIN authentication now supported. Html or plain text forma
    Downloads: 9 This Week
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  • 11
    Mailcheck is a simple, command line, configurable tool that allows multiple mailboxes to be checked for the existence of new mail messages. It supports both mbox and maildir-style mailboxes. It also supports remote POP3 and IMAP mailboxes.
    Downloads: 16 This Week
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  • 12
    SmartPost software provides the total electronic mail solution using UNIX/Linux,with IMAP,POP,webmail access as well as web-based administration and web-based control over the mail server.Project is closed.There are some better solutions on marketnow
    Downloads: 13 This Week
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  • 13
    YPOPs! is an application which emulates a POP3/SMTP mail server and provides free POP3 and SMTP access to Yahoo! Mail. It does not depend on Yahoo's POP3/SMTP mail server. You can use a mail client of your choice!
    Downloads: 2 This Week
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  • 14
    Columba
    Columba is an email client written in Java, featuring a user-friendly graphical interface with wizards and internalionalization support. Its a powerful mail management tool with features to enhance your productivity and communication.
    Downloads: 3 This Week
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  • 15
    Hastymail
    Hastymail is a fast, secure, rfc-compliant, cross-platform IMAP/SMTP client application written in PHP providing a clean web interface for sending and reading E-mail. This version of Hastymail is no longer being developed. We are now working on a new version, Hastymail 3, AKA, "Cypht". http://cypht.org
    Downloads: 3 This Week
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  • 16
    Java SMTP/POP EMail Server
    Provide an Open Source Java Email Server that supports POP3/SMTP.
    Downloads: 4 This Week
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  • 17
    Small program, which monitors email account via IMAPS (secure version of IMAP) protocol and inform user about new, unread messages. Coded in Java programming language.
    Downloads: 7 This Week
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  • 18
    Check given IP/Host presence in 106 RBLs. Now, you don\'t have to check a lot www sites, just run this script in console.
    Downloads: 6 This Week
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  • 19
    MailTo

    MailTo

    Use for sending email to your custmor at spacific date.

    This is an application to send email to your customer automatically at the mail expire date or some days, that you mention, before expire date.
    Downloads: 4 This Week
    Last Update:
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  • 20
    AtMail is an open source webmail client written in PHP. We aim to provide a elegant Ajax webmail client for existing IMAP mailservers, with less bloat and a focus on an intuitive, simple user interface.
    Downloads: 2 This Week
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  • 21
    Koolwired.Imap is a fully managed .NET IMAP client library written in C#.
    Downloads: 1 This Week
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  • 22
    Downloads: 3 This Week
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  • 23
    pop3spam is a POP3 client which connects to a POP3 server and deletes unsolicited mail in-place. It's possible to check for messages that exceed a certain limit and to scan header lines for special patterns (regular expressions).
    Downloads: 3 This Week
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  • 24
    Rumble Mail Server
    Rumble is a mail server suite for SMTP (ESMTPSA), HTTP, POP3 and IMAP4v1 with an extensive C/C++ and Lua API for scripting. It comes with support for SSL/TLS, SQLite and MySQL and has a web-based administration and webmail feature. Additional included modules feature greylisting, DNS blacklisting, SpamAssassin support and dynamic performance scaling as well as a multithreaded structure that allows for clustering of multiple servers for one or all domains, and with the ease of the Lua API, you can create your own new server mailing lists, CRM software, e-marketing and other extensions within minutes.
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    Downloads: 1 This Week
    Last Update:
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  • 25
    ImapArchiver is a tool which can be used to save the all imap account into a local directory/archive. The ideal objective is to used it with cron to automatically make a back up of your imap account
    Downloads: 2 This Week
    Last Update:
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