> It is also possible to have different postfix servers running at > different IPs within the same physical server, and have the dbmail > daemons use the standard ports on the alternate IPs. This is something > our new mail server will do... so I only have to have one physical box > handling all the different combinations of spam filtering our clients > want/need.
One alternative if you're somewhat adventurous is vserver: http://www.solucorp.qc.ca/miscprj/s_context.hc?dp=0 It's a patch to the linux kernel that allows multiple security contexts on the same physical machine. To someone in one of the contexts, it just looks like you are alone and have root on the box, except for some resource limitations, most notably in network operations. (a vserver can't change ip addresses, or to raw packets). I've been running it for about half a year with 2-4 contexts on a k6/2-450. (low end hardware 3 years ago) They're all test installations of various versions network services debian and they feel just about as responsive as the system would be alone on similar hardware. Well, as responsive as that system would be running 4 sshd daemons, 3 copies of postgres, email systems and apache. eric
