Here is my mail server program selection:
SMTP Server: Postfix 2.1.5
POP/IMAP Server: Courier-imap 3.0.8
Anti-Virus/Anti-Spam: Amavisd-new 2.2.0 w/SpamAssassin 3.0.1 & ClamAV 0.80
Webmail: SquirrelMail 1.4.3
I've setup pop/imap/smtp all to use SSL/TLS and have SMTP-AUTH for remote
users (able to configure laptops/remote users to send mail via port 2500
using SMTP-AUTH). Its nice as these protocols default to passing passwords in
plaintext.
I also use dnsrbl lists w/Postfix to reject mail from known spam hosts. The
above solution has been 100% effective in virus protection and has reduced
spam significantly (I am unsure of an exact percentage.. I'm guessing easily
85%+ effective even with very conservative settings).
There is a web-based front end for amavisd/spamassassin called Maia Mailguard
that will allow users to customize their mail settings. I am unsure if this
integrates with .procmail/.vacation and other mail features. Perhaps usermin
(webmin) might be useful? I haven't used these in a long time so I am unsure
of their current state.
Oh .. fyi, all of this is open source and freely available for download. :)
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