Open Source Perl Email Spam Filter Software

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 24261. 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.

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.

Open source DKIM library, MTA filter implementation and associated tools.

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, ...

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).

POPFile is an email classification tool with a Naive Bayes classifier, POP3, SMTP, NNTP proxies and IMAP filter and a web interface. It runs on most platforms and with most email clients.

SpamAssassin for Win32 is a free and powerful anti-spam filter for Windows. Includes a resident daemon for mail servers and a user-friendly personal spam filter that works with any POP3 account and any email client.

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.

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.

MailCleaner Open Source Edition is now discontinued but will continue under the spamtagger project https://github.com/SpamTagger [antispam] MailCleaner is an anti-spam / anti-virus filter SMTP gateway with user and admin web interfaces, quarantine, multi-domains, multi-templates, multi-languages. Using Bayes, RBLs, Spamassassin, MailScanner, ClamAV. Based on Debian. Enterprise ready. MailCleaner is an anti spam gateway installed between your mail infrastructure and the Internet. It includes a complete GNU/Linux OS and a graphical web interface for user and administrative access. It comes in the form of virtual machine templates.. - fully compatible with any SMTP mail server (Exchange, Zimbra, O365,...)

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

mail2nntp is a bridge from email realm to the newsgroup one. It can be used to replicate a mailing-list on a newsgroup server. It is a generic toot, using NNTP network commands.

Qmail-Scanner, is a Email content scanner that enables a Qmail Email server to scan all Email it receives for certain characteristics (normally viruses), and react accordingly.

Converts Outlook .mbx and .dbx files into standard RFC822 mail files. Mailboxes from newer versions of Outlook and Outlook express may not be supported.

This is an open source implementation of the draft DMARC specification.

AMaViS is a script that interfaces a mail transport agent (MTA) with virus scanners.

RadicalSpam Virtual Appliance takes full solution of RadicalSpam Community Edition , pre-installed in a OVF virtual machine ( Open Virtual Format ) compatible with the best virtualization platforms on the market , including VMware ESX Server. More information : http://www.radical-spam.org

A Perl script that you slip between your MTA (e.g. Sendmail) and your local mailer to remove executable (.EXE, .COM, .VBS, etc.) MIME attachments from email messages.

whatsnewfm is a filter for the daily freshmeat newsletter. It shows only news items that you have not seen before. You can also set up a list of "interesting" applications where you want to be informed of every update.

The OpenPEC project is a collaborative effort to develop an Open Source Certified E-Mail System (in italian: Posta Elettronica Certificata or PEC) as requided by the Italian law. See the DigitPA (CNIPA) site for details (http://www.cnipa.gov.it)

A.I. security app. Development ceased.

Abbruch is a commandline utility to ease the generation of banned/allowed/special actions to be applied to a list of users sending you email, by generating a .procmailrc file. requires: perl5, procmail

actively combat spam through realtime activity monitoring

Archer-Milter , A Sendmail spam filtering solution for system administrators.

Ardok Mail reader (ARM) is a mail checker written in perl/tk. The main goal of the programm is to manage the mails sent on a pop3 server. But it can also be used to write and read mails (on the server or on the hard drive).