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How to move spam mails sent to a shared folder automatically to a spam folder
Concern:
Only spam mails which are sent to a user mailbox are moved to a spam folder per default. Spam mails sent to a shared folder mailbox are tagged as spam by spamassassin but still delivered to the corresponding shared folder mailbox.
Solution:
Replace the smtp line in /etc/postfix/master.cf with:
smtp inet n - n - - smtpd -o content_filter=procmail:spamfilter -o smtpd_sasl_auth_enable=yes
Create the file /etc/procmailrc with the following content:
SENDER=$1
SHIFT=1
:0fw
| /usr/bin/spamc
:0
* ^X-Spam-Flag:.YES
* ^(To|Cc):.*(sharedfolder1|sharedfolder2|sharedfolder3).*$
| /usr/lib/cyrus/bin/deliver -e -r spamfolder -a mailadmin -m spamfolder
:0
| /usr/sbin/sendmail -i -f "$SENDER" -- "$@"
Where (sharedfolder1|sharedfolder2|sharedfolder3) are the names of the shared folders with direct mail delivery and where spamfolder in the /usr/lib/cyrus/bin/deliver line is a usual shared folder just created for spam mails which are sent to the different shared folders on your system.
