Spamassassin filtering is being applied to domains even when the domain option boxes for "Spam filtering enabled?" are unchecked.
Spamassassin processing is apparently *broken* as well. I have "Action for messages classified as spam" as "Append to mbox-format mail file", with a parameter of $HOME/spam.occmail. But nothing is ever delivered into that user's mailbox. I checked the /var/log/maillog and found a number of these messages apparently related to Spamassassin processing. The relevant portion is here:
(can't create user output file. Command output: procmail: Couldn't create "/var/mail/nobody" Cannot write to //.spamassassin/user_prefs: No such file or directory Failed to create default user preference file //.spamassassin/user_prefs Failed to run /virtual-server/lookup-domain.pl : No such file or directory at /etc/webmin/virtual-server/lookup-domain.pl line 10. procmail: Program failure (2) of "/etc/webmin/virtual-server/lookup-domain.pl" procmail: Unable to treat as directory "//Maildir" procmail: Error while writing to "//Maildir" procmail: Unable to treat as directory "//Maildir" procmail: Lock failure on "//Maildir.lock" procmail: Error while writing to "//Maildir" )