Segfaults in Clamsmtpd
I was having trouble with segfaults in clamsmtpd. What I discovered is that calmd was running under clamav and clamsmtpd was running under a different user. Make sure that they are bot running under the same account. In addition, the ctl file is critical, make sure that it matches in both clamd and clamsmtp's configuration.
This is a comment on "Postfix and Clam AV"