Is there a mailing list archive?
Theres a list-archive for simscan at http://dir.gmane.org/gmane.mail.qmail.simscan
I enabled the received line features, but it only shows "scanners: none" in the received line, although the message is scanned
You have to run
first, to initialize the version database. See also the next question.
What is the best practice to update simversions.cdb?
I run it from cron (as root) every hour (together with update_trend). It may miss a clam update, but that's acceptable for me.
Or you could make a sudo entry for the clam user and run sudo /var/qmail/bin/simscanmk -g a nice solution too :)
In order to make simscan work be sure /var/qmail/simscan has the same group qmail-smtpd is running. So if you have qmail-smtpd working with vpopmail user because you have vchkusr patch you should have /var/qmail/simscan with vpopmail group.
The easiest way to debug Simscan is on the command line. Run it like this:
QMAILQUEUE=/path/to/simscan SIMSCAN_DEBUG=2 qmail-inject somercpt@somedomain < a-mail.txt
in fact, I'd recommend testing simscan like this before enabling it on smtp level. It's way easier (and safer ;) ) to debug it this way first.