I use mimedefang testing, spamaassassing unstable, and kernel 2.4.23, on
my production external mx server.
Everything else is stable.
The only externally exposed service, sendmail is stable.
I tried unstable sendmail, but TLS didn't work.
And I would not have timelly updates.
(I was trying to resolve milter sock issues.)
Works great, using perl 5.8 instaed of 5.6.1 is a much better choice for
mimedefang.
Use clamdscan instead of clamscan, I got the clamd from the clam site, in
deb format.
Clamdscan is approximatelly 200 times faster then running clamscan.