I have used Netqmail 1.05 + SMTP Auth + Vpopmail 5.4.0 + SQWebmail 4.0.5. But my users have talked about changing the webmail, mainly because layout limitations and other resources like virtual disk, support online for many languages, instant messages when new emails are received, etc.
I look at SQuirelmail but it needs IMAP and I'd not like to install a new service.
I look also at Openwebmail but I didn't find a distribution integrated with QMail/VPopmail. Is there one?
Or are there other webmails more advanced than SQWebmail?