mod_smtpd is a modular SMTP server similar in spirit to qpsmtpd.

For developers it offers a dependable platform to quickly write a custom SMTP application without the burdens of portability, protocol, daemonization and/or process scheduling.

For system administrators it precludes the need for a separate SMTP daemon and also allows for simple replacement of SMTP backend without having to switch SMTP daemons (just load a different queue module!).

Features Include:

• Simple yet advanced plugin system based on Apache hooks.
• Close to nothing built in. All functionality is required by plugins.
• Use of Apache filters for the SMTP "DATA" command.

mod_smtpd hasn't been released yet. It is still alpha quality and isn't ready for production use. If you'd like to try it out development of mod_smtpd can be followed through the Subversion repositories. For public access you can use :

% svn checkout http://svn.apache.org/repos/asf/httpd/mod_smtpd/trunk/ mod_smtpd

• Installation instructions
• More documentation coming soon!

Discussions on mod_smtpd take place on the main HTTPd development mailing list.

• dev@httpd.apache.org - module development (archives).
• cvs@httpd.apache.org - svn commit logs for httpd, including mod_mbox (archives).

mod_smtpd started life as a 2005 Google Summer of Code project.