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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.
Per user/admin filtering of individual/group emails
FreeMe is a lightweight e-mail filtering and reorganization tool for reducing clutter and highlighting messages of interest. It is intended to allow multiple administrators to specify individual rules for handling roote-mails, but can also be used in single-user mode.
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...
A small library and two command-line tools to parse and convert Z notation from the "e-mail" mark-up into HTML code, or into UTF-8 text with box-drawing graphics, or into the Z Standard text format.
See the project's Wiki Home Page for details --- the "Wiki" button in the bar above, or the following link:
Blocks spam without blocking any legitimate messages
SMC anti-spam e-mail milter (plug-in) is an software application designed to significantly reduce the amount of SPAM/UCE (junk-mail) you receive. SMC uses a greylisting like technique to stop the junk-mail and a set of dynamic auto "whitelists" for unknown, but legitimate senders. In purpose of anti-virus protection the program can use very popular Clam AntiVirus engine as a back end.
A small and lightweight Sendmail Clam AntiVirus mail filter (milter). lclamav-milter scans messages for viruses/worms, accepts clean messages, rejects the bad, and helps stop the spread of e-mail viruses/worms.
TMDA is an open source anti-spam system and local mail delivery agent written in 100% pure Python. TMDA combines whitelists, blacklists, a challenge/response system, and special-purpose e-mail addresses called "tagged addresses" to thwart spam.
Auth0 Token Vault handles secure token storage, exchange, and refresh for external providers so you don't have to build it yourself.
Rolling your own OAuth token storage can be a security liability. Token Vault securely stores access and refresh tokens from federated providers and handles exchange and renewal automatically. Connected accounts, refresh exchange, and privileged worker flows included.
Publicly displays Postfix-policyd's blacklist in real time. Quite useful (in some countries even mandatory) for e-mail hosting to keep your customers informed about blocked smtp hosts and give them the chance to unsubscribe from SPAM-filtering.
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)
SMWrapper receives e-mails as standard sendmail program, filters them for X-PHP-Script in the Header and manages limits and informs the user and administrator when a limit is reached. After processing, the real sendmail program gets invoked.
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
A fast, client-server design for greylisting service. Initially intended for Postfix based e-mail servers, includes country identification and other tuning parameters.
TextMine is for the Perl hacker who is grappling with the problems of managing unstructured text from various sources. You can use these text mining tools to search the Web, index text, extract entities, categorize your e-mail, and summarize documents.
SMTPSpy Proxy is a "dumb" SMTP proxy that waits for inbound SMTP requests and forwards all them directly to an external SMTP server, while outputting all e-mails passing through to a specified disk location, for monitoring purposes.
Postfix Policy Server - e-mail administrators assert server-side SPAM/UCE filter control using SQL based white and black lists. Wildcards provide granular control of source user names, domains, and IP addresses on a per recipient basis.
g-milter, or "guerilla milter", is an open source filter for restricting arriving mail not checked by existing filters due to standards compliance. Running this will catch more spam but almost certainly violates e-mail standards. Requires sendmail.
RelMail is a set of scripts written in Perl that uses sendmail-milter api to copy and archieve in a SQL database all e-mail (headers, content, attachments) sent or received through the sendmail smtp server.
SFM stands for Spam Free Mail and is a free subscription-based E-Mail server offering automatic dynamic aliases personalized to senders. Developed in Tcl under RedHat 9.0, requires qmail, the Gimp, and BerkeleyDB. Working.
S2 (Spam Sentinel) aims to create an open source SMTP server implementing filtering techniques such as Bayesian to eradicate spam e-mails before they make it to your server.
SPASTIC (Simple Procmail Anti-Spam Templates Improved Code) allows filtering of e-mail using simple keywords. The scripts, by default, have different filters for the headers and the body of messages. It also includes a whitelist.