Zimbra is a powerful mail server that allows “out of office replies” calendar sharing (paid version), automatic disclaimer added to mail, webmail, Imap and many more features.
The following articles show how to istall Zimbra and provide some other tips and tricks related to Zimbra.
How to install Zimbra
Adding a disclaimer to Zimbra with Altermime
How can I get mail out of quarantine in Zimbra?
Mailing from the shell prompt if Zimbra is installed
While the "paid" for Zimbra officailly supports archiving. Archiving can be accomplished with the Open-source version too.
