Unfortunately, people screw up addresses enough and
for this to be a real problem.
# to use with postfix main.cf: mailbox_command = /etc/dc-dlvr "$EXTENSION"
DELIVER=/usr/lib/dovecot/deliver
-# my personal preference is to use a catchall account to avoid generating
-# backscatter, as invalid emails are usually spam
-case $USER in
-catchall) exec $DELIVER ;;
-esac
-
# change if your spamc/spamd listens elsewhere
spamc='spamc'