I'd personally vouch for Qmail myself.
So would I, for my environment.
Having been an administrator now
for mail servers in general for nearly 15 years, with experience with
most notable mailers, Qmail by far lends itself to be the most highly
configurable mailer assuming you know what you want ahead of time.
experienced sysadmins, once they know what they want, can apply those
patches to qmail with ease and roll out additional Qmail installations
with a single package. Very easy indeed.
Bob, as for 'backscaatter spam' (assuming I understood you), that's
http://www.interazioni.it/opensource/chkusr/ (as an example)
...which works very well.
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