Start sendmail in outbound-only mode
/usr/sbin/sendmail -L sm-mta -bd -q30m -ODaemonPortOptions=Addr=localhost /usr/sbin/sendmail -L sm-queue -q30m /usr/sbin/sendmail -L sm-msp-queue -Ac -q30m
Delete mail with known spam content
cd /usr/spool/mqueue
text="1THsmGl2x39V/tKywURpIII5GoSU+uJIOJcL8Wm4f"
for i in `grep -l "$text" df*|sed -e 's/^..//'`
do mv ??$i spam/
#ls -l ??$i
done