* ssoma - http://ssoma.public-inbox.org/README
* SpamAssassin (spamc/spamd)
* MTA - postfix is recommended
+* lynx (for converting HTML messages to text)
* Perl and several modules: (Debian package name)
- CGI perl-modules[1]
- Date::Parse libtimedate-perl
- Email::MIME::ContentType libemail-mime-contenttype-perl
- Encode::MIME::Header perl
- File::Path::Expand libfile-path-expand-perl
- - IPC::Open2 perl
- IPC::Run libipc-run-perl
- Mail::Thread (2.5+) libmail-thread-perl
- URI::Escape liburi-perl