Why you not use qmail if you will have a free mailserver look at http://www.qmail.org and if you want qmail like webmail you can do it search on http://freshmeat.net after webmail and you fins some
Astaro should NEVER include this. This is a permiter security device and the last thing you want is servcies running on this device that are not essential to it's operation. It's far safer to have clients dnat to a webmail server, since that way a flaw in the webmail program (which are found and exploited all the time) doesnt exploit the firewall itslef and possibly grant an intruder access into thta device. Just my 2 cents.
