Email Spam Filter Software

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Browse free open source Email Spam Filter software and projects below. Use the toggles on the left to filter open source Email Spam Filter software by OS, license, language, programming language, and project status.

  • Migrate to innovate with Red Hat Enterprise Linux on Azure Icon
    Migrate to innovate with Red Hat Enterprise Linux on Azure

    Streamline your IT modernization journey with a holistic environment running Red Hat Enterprise Linux on Azure.

    With Red Hat Enterprise Linux on Azure, businesses can confidently modernize their IT environment, knowing they don’t have to compromise on security, scalability, reliability, and ease of management. Securely accelerate innovation and unlock a competitive edge with enterprise-grade modern cloud infrastructure.
  • HRSoft Compensation - Human Resources Software Icon
    HRSoft Compensation - Human Resources Software

    HRSoft is the only unified, purpose-built SaaS platform designed to transform your complex HR processes into seamless digital ones

    Manage your enterprise’s compensation lifecycle and accurately recognize top performers with a digitized, integrated system. Keep employees invested and your HR team in control while preventing compensation chaos.
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    Scrollout F1

    Scrollout F1

    An easy-to-use anti-spam email gateway

    • Designed for Linux and Windows email system administrators, Scrollout F1 is an easy to use, already adjusted email firewall (gateway) offering free anti-spam and anti-virus protection aiming to secure existing email servers, old or new, such as Microsoft Exchange, Lotus Domino, Postfix, Exim, Sendmail, Qmail and others. • Built-in multilayer security levels make configuration effort equal to a car radio. • It combines simplicity with effective protection using powerful open source with additional set of rules & filters. • Available as 64bit: - ISO image (Internet connection required during installation) - install from scratch (Internet connection required during installation). • Minimum Requirements (for 5,000 messages/day): 1 GB of RAM 30 GB storage drive 1 Processor x86/AMD64 1 Ethernet x 1 IPv4 address UDP ports: 53 123 4500 6277 24441 TCP ports: 25 80 443 2703
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    Downloads: 170,797 This Week
    Last Update:
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  • 2
    Anti-Spam SMTP Proxy Server

    Anti-Spam SMTP Proxy Server

    Anti-Spam SMTP Proxy Server implements multiple spam filters

    The Anti-Spam SMTP Proxy (ASSP) Server project aims to create an open source platform-independent SMTP Proxy server which implements auto-whitelists, self learning Hidden-Markov-Model and/or Bayesian, Greylisting, DNSBL, DNSWL, URIBL, SPF, SRS, Backscatter, Virus scanning, attachment blocking, Senderbase and multiple other filter methods. Click 'Files' to download the professional version 2.8.1 build 23131. A linux(ubuntu 20.04 LTS) and a freeBSD 12.2 based ready to run OVA of ASSP V2 are also available for download. NOTICE: V1 development has been stopped at the end of 2014 (1.10.1 build 16060). Possibly there will be done some bugfixing in future. Please upgrade to V2, which is and will be actively maintained.
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    Downloads: 73,370 This Week
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  • 3

    milter manager

    Protects you from spam mails and virus mails effectively with milter

    This project has been moved to https://milter-manager.osdn.jp/ milter manager protects you from spam mails and virus mails effectively with milter. milter manager has embedded Ruby interpreter to control milters flexibly. milter manager can be used with Sendmail on Postfix on Ubuntu, CentOS, FreeBSD and so on.
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    Downloads: 4,287 This Week
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  • 4
    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: 348 This Week
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  • Simply Smarter SaaS Backup for Microsoft, Google and Salesforce. Icon
    Simply Smarter SaaS Backup for Microsoft, Google and Salesforce.

    Spanning proactively defends mission-critical data with automated backup that is secure, affordable and insanely easy to use.

    Comprehensive data protection. Simple recovery. Built in trust and transparency. See for yourself why Spanning is the leading cloud-to-cloud backup solution.
  • 5
    E-MailRelay

    E-MailRelay

    SMTP email proxy and relay server

    E-MailRelay is a simple SMTP proxy and relay MTA, written in C++, for Linux and Windows. As a proxy all messages can be passed through a user-defined program, such as a spam-filter, which can drop, readdress, or edit messages as they pass through.
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    Downloads: 323 This Week
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  • 6
    Open source DKIM library, MTA filter implementation and associated tools.
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    Downloads: 261 This Week
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  • 7
    Python Milter

    Python Milter

    Python API for Sendmail Milters.

    Python API for Sendmail Milters. Related modules provide features such as content filtering, SPF, and reputation tracking. Changes are posted first to https://github.com/sdgathman/pymilter and related repos.
    Downloads: 206 This Week
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  • 8

    bogofilter -- Fast Bayesian Spam Filter

    Fast Bayesian spam filter along lines suggested by Paul Graham

    The bogofilter package implements a fast Bayesian spam filter as suggested by Paul Graham in "A Plan For Spam" <http://www.paulgraham.com/spam.html>. It is written in C. Supported platforms: Linux, FreeBSD, Solaris, OS X, HP-UX, AIX, RISC-OS, ...
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    Downloads: 105 This Week
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  • 9
    DSPAM is a scalable and open-source content-based spam filter designed for multi-user enterprise systems.
    Downloads: 45 This Week
    Last Update:
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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.
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    PopTray is a mail notifier written in Delphi for the Windows platform. It sits in your tray notification area and check mail from multiple accounts on a timer interval. Preview, Delete, Rules, Plug-ins and translated into more than 30 languages.
    Downloads: 67 This Week
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  • 11
    EmailValidator

    EmailValidator

    PHP Email address validator

    A library for validating emails against several RFC. This library aims to support RFCs 5321, 5322, 6530, 6531, 6532, and 1035. Composer is required for installation. Spoofchecking and DNSCheckValidation validation requires that your PHP system has the PHP Internationalization Libraries (also known as PHP Intl). PHP version upgrades will happen to accomodate to the pace of major frameworks. Minor versions bumps will go via minor versions of this library (i.e: PHP7.3 -> v3.x+1). Major versions will go with major versions of the library. EmailValidatorrequires you to decide which (or combination of them) validation/s strategy/ies you'd like to follow for each validation. Note that warnings are deviations from the RFC that in a broader interpretation are acceptded. It's easy to extend! You just need to implement EmailValidation and you can use your own validation.
    Downloads: 1 This Week
    Last Update:
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  • 12
    Web Spider, Web Crawler, Email Extractor

    Web Spider, Web Crawler, Email Extractor

    Free Extracts Emails, Phones and custom text from Web using JAVA Regex

    In Files there is WebCrawlerMySQL.jar which supports MySql Connection Free Web Spider & Crawler. Extracts Information from Web by parsing millions of pages. Store data into Derby Database and data are not being lost after force closing the spider. - Free Web Spider , Parser, Extractor, Crawler - Extraction of Emails , Phones and Custom Text from Web - Export to Excel File - Data Saved into Derby and MySQL Database - Written in Java Cross Platform Also See Free email Sender : https://sourceforge.net/projects/gitst-free-email-ender/ Please install Microsoft OpenJDK to start the application https://www.microsoft.com/openjdk
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    Downloads: 109 This Week
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  • 13
    Postfix greylisting policy service with auto-white-listing written in Perl with SQL database as storage backend. Greylisting stops 50 to 90 % junk mails (spam and virus) before they reach your Postfix server (saves BW, user time and CPU time).
    Downloads: 14 This Week
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  • 14
    From this time on, LibPST will not be maintained here. It will be maintained at http://alioth.debian.org/projects/libpst/. Also, check the version at http://www.five-ten-sg.com/libpst
    Downloads: 13 This Week
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  • 15
    A milter program for domain authentication technologies.
    Downloads: 12 This Week
    Last Update:
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  • 16
    Simscan enables qmail to reject viruses, spam, and block attachments during the SMTP conversation so the email never makes it into your email server. Supports ClamAV, SpamAssassin, DSpam and other virus scanners. Very efficient and written in C.
    Downloads: 11 This Week
    Last Update:
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  • 17
    Fast, intelligent, automatic spam detector using Paul Graham style Bayesian analysis of word counts in spam and non-spam emails. Filtering adapts to personal tastes automatically. No manual rule creation required. Intended for use with procmail, maild
    Downloads: 14 This Week
    Last Update:
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  • 18
    MailZu is a simple and intuitive web interface to manage Amavisd-new quarantine. Users can view their own quarantine, release/delete messages or request the release of messages. MailZu is written in PHP and requires Amavisd-new version greater than 2.3.0
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    Downloads: 13 This Week
    Last Update:
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  • 19
    SpamPal is a mail classification program that can help separate your spam from the mail you really want to read. SpamPal includes support for POP3, IMAP4 and SMTP accounts and can be extended by dozens of plugins and tools and is available in 6 languages
    Downloads: 15 This Week
    Last Update:
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  • 20
    Vipul's Razor is a distributed, collaborative, spam detection and filtering network. The primary focus of the system is to identify and disable an email spam before its injection and processing is complete.
    Downloads: 53 This Week
    Last Update:
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  • 21
    `archivemail' is a tool written in python for archiving and compressing old email in mailboxes. It can move messages that are older that the specified number of days to a mbox-format mailbox compressed with gzip, or optionally just delete old email.
    Downloads: 12 This Week
    Last Update:
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  • 22
    DKIMproxy is an SMTP-proxy that implements the DKIM and DomainKeys standards, to sign and verify email messages using digital signatures and DNS records. It can be used to add DKIM support to nearly any existing SMTP mail server.
    Downloads: 41 This Week
    Last Update:
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  • 23
    Bayesian anti-spam classifier written in Python.
    Downloads: 9 This Week
    Last Update:
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    NOTE: dkim-milter has been replaced by OpenDKIM, available at http://opendkim.org/ dkim-milter consists of two parts: A milter-based application (dkim-filter) which plugs in to Sendmail to provide DomainKeys Identified Mail service, and a library (libdkim) which can be used to build DKIM-compliant applications or MTAs.
    Downloads: 21 This Week
    Last Update:
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  • 25
    iXhash is a plugin for the popular spam filter SpamAssassin. It computes MD5 checksums of fragments of the body of an e-mail and compares them to those of know spam using DNS queries to a RBL-like name server. In effect this gives SpamAssassin access
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    Downloads: 18 This Week
    Last Update:
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Open Source Email Spam Filter Software Guide

Open source email spam filter software is a type of software that helps to keep unwanted emails from appearing in your inbox. It works by scanning incoming emails for words or phrases that are commonly associated with unsolicited messages, such as advertisements and other forms of promotional material. Once it identifies one of these items, the software will automatically delete it or place it into a designated “spam” folder so you don’t have to worry about seeing it in your main inbox.

There are many reasons why people may choose to use open source email spam filters instead of traditional commercial products. For starters, most open source software is free and can be installed easily without requiring any technical knowledge or expertise; compared to many commercial products which often come at considerable expense, this makes open source alternatives an attractive option for those wanting to protect their inboxes from unwanted messages. Additionally, because the open source code is freely available online, users have more control over how they customize the filter’s settings and behavior according to their own needs; compared to closed-source software where users must rely on the vendor for configuration changes and fixes when necessary, this can be very beneficial.

Another benefit of using open source email spam filters is that developers can make more frequent updates than what can be expected with closed-source products; as new methods used by spammers evolve, developers are able implement countermeasures much faster with an open source solution. This makes such filters much better at keeping up with rapidly changing trends in terms of how malicious actors send out unwanted emails. Plus, because these solutions are built upon a decentralized community-driven platform rather than relying on a single entity (such as Microsoft Exchange), if something goes wrong with one particular version then users have the assurance knowing there will always be another alternative out there maintaining overall system integrity regardless. All in all, having an open source email spam filter running alongside a regular anti-virus program gives users peace of mind knowing their private info won't fall into the wrong hands due to someone sending them malicious messages unawarely.

Features Offered by Open Source Email Spam Filter Software

  • Spam Detection - This feature helps identify and filter out known sources of spam, such as emails with misspelled words or links to malicious websites. It also includes Bayesian filtering, which uses machine learning algorithms to detect new patterns of behavior in incoming messages.
  • Malware Detection - This feature scans incoming emails for viruses, worms, Trojans, spyware, and other forms of malicious code that could potentially harm the user’s computer or data.
  • Phishing Protection - This feature detects attempts at phishing attacks by scanning email content for suspicious links or electronic addresses that may be trying to collect personal information from the user.
  • Whitelisting & Blacklisting - Users can create lists of trusted or blocked senders to better manage their inboxes by allowing only certain types of emails through (whitelisting) or preventing all messages from specific domains from reaching the inbox (blacklisting).
  • Challenge-Response Verification – Through this feature, unknown senders are challenged before they’re allowed access into an inbox. The challenge requires them to solve a simple question before they can deliver their message; this helps reduce unsolicited mail while still keeping legitimate contacts accessible.

Types of Open Source Email Spam Filter Software

  • SpamAssassin: SpamAssassin is a popular open source email spam filter that uses rules-based detection and scoring methods to identify potential spam. It examines emails for specific patterns or indicators of spam and can be configured by the user.
  • ClamAV: ClamAV is an open source antivirus engine designed specifically for scanning email messages for malicious content. It combines signature-based detection with heuristic analysis to identify known and unknown viruses, trojans, worms, and other malware.
  • MailScanner: MailScanner is another open source solution for detecting suspicious emails. It looks at the emails’ contents and headers to recognize potentially hazardous material before it reaches the recipient’s inbox.
  • Apache SpamAssassin: Apache SpamAssassin is an advanced filtering system that utilizes artificial intelligence technologies like Bayesian filtering to determine if incoming email messages contain possible threats or should be labeled as possible junk mail.
  • Greylisting: Greylisting is an effective anti-spam technique which checks a sender's IP address when they send their first message – if no record exists then it requires them to resend before delivering subsequent messages from that sender automatically.

Advantages Provided by Open Source Email Spam Filter Software

  1. Low Cost: Open source email spam filter software is generally free or very low cost. The cost savings from using this type of software can be substantial, especially for large organizations that deal with a high volume of email traffic.
  2. Fewer False Positives: Most open source email spam filter software is highly accurate and less prone to producing false positives than many paid solutions. This reduces the need to manually review all incoming emails, which saves time and resources.
  3. Flexibility: Many open source email spam filter solutions are highly customizable and can be tailored to meet the specific needs of an organization’s security requirements. This flexibility allows IT administrators to apply custom rules regarding what constitutes acceptable content in addition to the pre-defined rulesets that come with the solution itself.
  4. Scalability: As businesses grow, they may face challenges when handling increased demand on their mail servers due to large volumes of unwanted junk emails being sent out every day. Open source email spam filters have been designed with scalability in mind and therefore work just as well on small networks as they do on larger ones.
  5. Easy-to-Use Interface: Setting up and managing an open source email spam filter is usually pretty straightforward thanks to their intuitive graphical user interfaces and easy-to-follow documentation guides for installation and setup process.

What Types of Users Use Open Source Email Spam Filter Software?

  • Businesses: Open source email spam filter software is used by businesses of all sizes to protect their networks and servers from malicious attacks. It can help organizations protect sensitive information and valuable data, while ensuring that emails are delivered quickly and efficiently to the right people.
  • Home Users: Home users may use open source email spam filter software as an added layer of security when accessing their personal emails. The software can identify suspicious messages, allowing home users to take caution and prevent malware or phishing attacks.
  • Educational Institutions: Schools and universities may leverage open source email spam filters for all incoming emails in order to ensure that students are kept safe from potential cyber security threats. Additionally, the software helps maintain a healthy learning environment by filtering out unwanted or inappropriate content from making its way into student inboxes.
  • Government Organizations: Open source email spam filter solutions are often used by government agencies to control access to sensitive information as well as protecting confidential communications between departments within the organization. The software allows administrators to define rules for incoming emails in order to ensure only authorized personnel have access.
  • Private Companies & Enterprises: Private companies with large infrastructure systems often rely on open source spam filters for complete protection against infiltration attempts such as Denial-of-Service (DoS) attacks. These companies also use this type of software in order manage employee accounts and monitor internal communication across departments within the organization more closely.

How Much Does Open Source Email Spam Filter Software Cost?

Open source email spam filter software is available for free, making it a great option for those looking to save money. There are several open source programs available, such as SpamAssassin, MailWasher Free, and QSF Bayesian Filter. These programs work by analyzing incoming messages to identify potential spam and alert you when they believe an email is malicious.

Most open source email spam filter software is extremely easy to install and setup, so you don't need any technical knowledge or skills. Some of these programs also come with detailed help documentation that can guide you through the process if needed. Additionally, because these programs are open source, there may be community forums or discussion boards where users can ask questions and discuss their experiences with the software.

Overall, while some of these programs may offer additional features (such as blocking certain countries from sending emails) with a paid version - most of them are completely free to use. This makes open source email spam filter software an excellent option for those who don’t have large budgets but still want the protection provided by quality anti-spam filters.

What Software Can Integrate With Open Source Email Spam Filter Software?

Many types of software can integrate with open source email spam filter software. Security solutions such as virus scanners, malware blockers and firewalls can be integrated to protect emails from malicious attacks while they are being filtered. Email clients such as Outlook, Gmail or Apple Mail can also be integrated to view emails after the filtering process is completed. Additionally, marketing automation platforms like Salesforce and HubSpot often provide utilization for open source email spam filter projects so that users of their software are able to make use of the same tools. Analytics programs including BigQuery and Apache Hadoop can also be utilized for monitoring the effectiveness of the filter for further optimization.

Trends Related to Open Source Email Spam Filter Software

  1. Increased Security: Open source spam filter software provides organizations with improved security, since it is regularly monitored and updated to ensure the newest spam filtering protocols are always in place. This helps protect organizations from malicious attacks as well as any potential data breaches.
  2. Cost Savings: Open source email spam filter software is typically free to use, eliminating the cost of purchasing expensive proprietary solutions. This can help organizations save money in the long run by not having to invest in costly email protection software.
  3. Flexibility: Open source email spam filter software offers users the ability to customize the settings according to their preferences and needs. This allows users to tailor their settings and make sure that only relevant emails are filtered out while valid emails are still allowed through.
  4. Scalability: Open source email spam filters allow organizations to scale their security protocols as needed, easily increasing or decreasing their level of protection without needing to purchase additional software or hardware.
  5. Easy Integration: Since open source email spam filter software is compatible with many different types of operating systems, it is relatively easy for organizations to integrate it into their existing systems. This eliminates the need for any additional training or technical staff, reducing costs and making implementation easier overall.

How To Get Started With Open Source Email Spam Filter Software

Getting started with using open source email spam filter software in American English is a relatively straightforward process. To get started, the user should first identify an appropriate open source software package that meets their needs. The most popular options include SpamAssassin, SpamBayes, Apache-SpamAssassin, and ClamAV/ClamWin.

Once the desired package has been selected, the user should install it on their computer. Depending on the open source software package and how it has been packaged (e.g., as an RPM or a DEB file), installation may involve running a single command from the command line or installing several components through a graphical interface. If assistance is needed during installation, many of these packages come with detailed instructions for installation and configuration which can be found online through various sources such as web forums or discussion boards dedicated to that particular product/package.

Once installed and configured correctly, some of these packages require manual filtering to properly classify emails sent to users’ inboxes as “spam” or “not spam” based on specific criteria programmed into the software by whoever coded it initially. For example, SpamAssassin allows users to specify certain words which will trigger an automatic classification of emails containing those words as “spam” (regardless of whether they are legitimate or not). Once this is set up properly by a user with knowledge of programming languages like HTML and PHP, all incoming messages will be scanned for these keywords before being routed to either the “spam” folder or individual mailboxes accordingly.

For those who do not know how to program such filters manually but would still like extra protection from unwanted emails, there are commercial versions available — at an additional cost—which come pre-programmed with labels like ‘unsolicited bulk emailers’ (UBE), phishing site detection services etc., so all one needs to do is enable them depending on what type of protection they require while also maintaining flexibility if they need more control over their own personalized settings too.