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Our Free Plans just got better! | Auth0
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You asked, we delivered! Auth0 is excited to expand our Free and Paid plans to include more options so you can focus on building, deploying, and scaling applications without having to worry about your security. Auth0 now, thank yourself later.
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.
mapSoN is a challenge/response spam filter for Unix
mapSoN is a spam filter for Unix that is installed via the system's ".forward" mechanism. The filter uses a challenge-response scheme to build a white-list of known senders, who may pass the filter without being challenged.
Chainmail is a Sendmail mail filter (milter) that manipulates emails that pass through Sendmail server in various ways. Under control of its configuration file, chainmail can reject messages, change their headers and bodies, add and remove recipients.