This is because of the "clamdscan: corrupt or unknown clamd scanner error or memory/resource/perms problem - exit status 512/2" error I'm getting, while unable to fix it with "chown qscand:qscand /var/log/clamav/clamd.log; qmail-scanner-reconfigure".
If I temporarily disable qmail-scanner at least mail is being delivered.
If ClamAV is the problem, you can stop the clamd service and reconfigure qmail-scanner: service clamd stop && qmail-scanner-reconfigure. Obviously mail won't be scanned by ClamAV after that.
it pulls down the latest version available in the archive. What distribution are you on? The problem might be you're using something I can't support any more. Right now I'm building for:
CentOS 4/5
RHEL 4/5
Fedora 4-8