I suggest greylist and antivirus/antispam in the MTA instead of MDA/MUA... just ensure all will pass through the milter..
e.g. milter-greylist, spamassassin, spamass-milter. clamav/clamd, clamav-milter are all default package u can find in the latest CentOS/Fedora. Implementation.. my new server (CentOS) is setup 2 days ago.. this part used < 30 mins to complete.. perhaps because I play with it before so no problem... > Whats a good antispam solution? > I am using sendmail and dovecot 1.1. I came across dovecot's antispam > plugin, but it seems it does not support 1.1 yet. I am also looking > for something non-perl based. > > I am already doing some greylisting with sendmail milter. > > Any other good suggestions? If not, I guess I might have to downgrade > back to 1.0 dovecot. > > Thanks