This script is a simple content filter wrapper for postfix. It examines the recipient to determine the dspam user and domain and then processes accordingly. Mail destined for other domains (say you pass outbound mail through your mail relay gateway) is passed back to postfix with no processing.
Because this filter handles normal dspam processing as well as user re-training, there's no need to play with postfix aliases or virtual domains as many other dspam HOW-TOs do. It also eliminates unnecessary dspam processing by ONLY dealing with mail destined to your domain.
#!/bin/sh PATH=/usr/local/bin:/usr/bin:/bin SENDMAIL="/usr/sbin/sendmail" DSPAM="/usr/local/bin/dspam" MYDOMAIN="example.com" # Get arguments sender="$1"; shift recip="$1"; shift # Parse out the username from the recipient user=`echo $recip | sed -n 's/^\(.*\)@.*/\1/p'` # Parse out domain from the recipient domain=`echo $recip | sed -n 's/.*@\(.*\).*/\1/p'` if [ -z "$user" ]; then echo "Can't determine user" exit 75 # EX_TEMPFAIL fi if [ "$domain" = "$MYDOMAIN" ]; then $DSPAM --deliver=innocent,spam --user "$user" -i -f "$sender" -- "$recip" elif [ "$domain" = "spam.$MYDOMAIN" ]; then $DSPAM --user "$user" --class=spam --source=error elif [ "$domain" = "ham.$MYDOMAIN" ]; then $DSPAM --user "$user" --class=innocent --source=error else $SENDMAIL -i -f "$sender" -- "$recip" fi exit $?