If you have a Debian computer connected permanently to the internet, this document will allow you to be able to:

• receive and store emails for your users
• let your users retrieve the email through IMAP and POP3 - even with SSL to encrypt to connection
• receive and forward (relay) email for your users if they are authenticated
• offer a webmail interface to read emails in a web browser
• detect most spam emails and filter them out or tag them