SME 7 is using the qpsmtpd plugin
/usr/share/qpsmtpd/plugins/virus/clamav for virus scanning. This plugin does not add an 'X-Virus-Scanned...' header.
You can verify that virus scanning is working by looking at /var/log/qpsmtpd/current; any email with a virus should generate a line containing both 'clamav' and 'DENY', so
grep -h clamav.*DENY /var/log/qpsmtpd/* | tai64nlocal | less will scan all of your qpsmtpd logs, extract lines about messages with viruses, and format the timestamp for humans...
The 'clamdscan' plugin for qpsmtpd does output an 'X-Virus-Scanned' header; I don't know why SME uses the 'clamav' plugin and not 'clamdscan'. You may be able to template your qpsmtpd plugins files to use clamdscan instead of clamav with no problems (or there may be some reason that this just doesn't work on SME...)
You can install Brian Read's 'mailstats' contrib to get daily emails summarizing your mail server activity. He's just announced a new version here:
http://forums.contribs.org/index.php?topic=36567.0If you decide to start digging into the qpsmtpd logs to figure out what's up, you may want to read up on the qpsmtpd log files and the tools for analyzing them:
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http://forums.contribs.org/index.php?topic=36655.0-
http://forums.contribs.org/index.php?topic=34071.0