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Popper
Popper is a small and simple solution to messaging between Linux and Windows-based machines....
sSMTP
sSMTP is an extremely simple MTA (Mail Transport Agent) to get mail off the system to a mail hub....
Purify
Purify is tool to filter email, trace and report spam. Simple to set up. Very powerful features....
Gordano Messaging Suite
Gordano Messaging Suite is a highly flexible and reliable suite of messaging products....
Columba
Columba is an Email Client written in Java, featuring a user-friendly graphical interface with wizards and internationalization....
Ricochet
Ricochet project traces the names and addresses of the systems where the spam originated from......
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MailStore
MailStore is a tool that is built in python and provides a mail proxy for POP3,IMAP4 and SMTP protocols....
Buffy and Libbuffy
Buffy displays a window with a summary of your mailboxes and lets you open them in your mail program....
Evolution Data Server
Evolution Data Server provides a single database for common, desktop-wide information....