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OpenBottle is a per user anti-spam email system based on a sender authenticated
whitelist mechanism. The core of the system is written in Perl, with a web
driven user interface in PHP.
OzoneFarm is a eCommunity-building project aimed at promoting open source computing and distribution and generation of open content. The goals and strategies for forming the community are being discussed in an open forum.
You can filter your email using a bayesian like statistical method. Written in 100% Python, easily extensible, and is used as a pop3 proxy to reduce the intrusion on your system.
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PDFassassin is a module for Spamassassin which scans the content of PDF attachments against the spamassassin engine and appends the resulting spam score to the overall score of the email message.
PHP Verify Mail designed to partially prevent automatic/manual registrations based on entering invalid email like user@unexiste.nt which is regexp-valid but not correct. It checks DNS records to ensure domain & MX ok. Same as "phpvmail" project.
libsieve-php is a library to manage and modify sieve (RFC5228) scripts. It contains a parser for the sieve language (including extensions) and [not yet] a client for the managesieve protocol. It is written entirely in PHP 5.
PHPMailTo: is a PHP processor for email address links, it attempts to thwart the practices of spammers who harvest emails. It does not suffer from the flaws of other popular practices like JavaScript fixes, mailto: modifications or Unicode translations.
Tools for a mail delivery service, including LMTP and POP3 servers and also getpwnam() emulation. Mail is stored in Maildir++ format (qmail plus courier extensions as soft quota and subfolders). User defined filter and virtual domains are supported.
SKUDONET is designed to enhance service quality with advanced load balancing capabilities. Allowing scale your infrastructure effortlessly while maintaining unwavering data security, ensuring the continuity of your operations.
Postfix Log Parser in Python is a log analysis tool written in python language to get statistic reports and detect anomalous behaviours on a mail server based on Postfix and Cyrus
POP3 Spam Filter Proxy is a multiuser POP3 proxy written in Java. Other than most other email filtering programs it works passively and transparently each time a user checks her or his mailbox. The filters so far are be based on regular expression searche
NOTICE: Keep in mind that POP3ye is alpha software and by definition it is a long way from finished.
POP3ye is a fully featured web-based e-mail client written in Object Oriented PHP 5. It ony supports the POP3 protocol.
POPMail applies user-defined rules to messages
in a mailbox in order to allow you to delete some emails before
receiving them. For example, you can delete emails with a given
From: (sender) header, or larger than a max size.
A milter (sendmail plugin with the ability to filter messages at the SMTP level) that lets each prospective recipient decide whether or not they want the message and rejects it if everyone agrees it's not wanted. Each user can examine the full message.
Antispam, antivirus, authenticating SMTP daemon. Integrates with qmail, sendmail, stunnel, etc. It's simple Perl, so you can hack it to suit your needs. Supports RBLs, mx on from, bounce evil phrases, virus scanning...
A simple, small-scale mail delivery agent (MDA) and SMTP relay written in Perl which allows filtering and modification of both incoming and outgoing messages using arbitrary, per-user or site-wide rules. Requires "Maildir"-style mail storage.
PerlTix flags in/outgoing mail which allows internal addresses (i.e. support@ includes: tech1@, tech2@) to be reached through a single point of entry (i.e. support@). The ticket-ID also allows the admin to cross-ref w/other sub-systems (eg. webserver)
The PigeonAir Project aims at releasing an Open and Free GPL solution to easily build up clustered, scalable and modular email services, targetted to satisfy all ISP needs.