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Ruby script framework for the encryption and decryption of email according the GPG/MIME Format (RFC 3156). It can be used for e.g. for Apple' Mail as replacement for GPGMail.
Cheescloth is a security script that is used to monitor and block email being brute force sent to your mail server by zombie machines in control by spammers and hackers. It also will catch and block hackers trying to hack your server via SSH connection
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phpMyBlacklist: A project for creating and managing an email blacklist or RBL lists. The project includes steps for setting up the required zone in your name server, the required database, the web administration and a simple shell cronjob script.
Botkiller is a php-script which helps to flood the databases of bots, searching the web for email-adresses. Its goal is to create a huge network of servers running the script and to trap the bots in it while feeding it useless adresses.
-- DISCONTINUED! see Homepage -- SpamCruncher is a small Perl-Script, that uses the SpamAssassin-engine to identify spam on remote POP3- or IMAP-Servers. So you only need SpamCruncher if your E-Mail host doesn't offer you free anti-spam services.
Modified amavis e-mail scanner script to work with mysql database for e-mail journal. Included simple PHP script for read summary of e-mail and virus traffic.
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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.
Clarke is a Perl script for automatically replying to email. It has a featureful command line, and can be run from a .forward or .qmail file or interactively. It is used by The Apache Software Foundation.