It does here. Do you have it Enabled?
I'm running SME 7.3, upgraded from 7.2 if that is relevant.
The web interface said it was but:
[root@srv1 etc]# config getprop spamassassin status
disabled
[root@srv1 etc]# config getprop spamd status
enabled
I then toggled the setting in the web page to "disabled" saved, then back to "enabled" saved and now have:
[root@srv1 etc]# config getprop spamassassin status
enabled
[root@srv1 etc]# config getprop spamd status
enabled
I then used the web interface "reconfigure" option in the reboot/shutdown and let that complete and reboot etc. I'm still not seeing any tag lines in email headers. Logged in at the command line a ps -xa shows spamd running and a couple of spamd children.
I assume that qpsmtpd is what calls spamassassin and ClamAV the latter is working (at least a tag line is there) but not anything from SA. Where would qpsmtpd be looking to know to call SA?