smtp      inet  n       -       -       -       -       smtpd
   -o content_filter=spamassassin
smtps      inet  n       -       -       -       -       smtpd
   -o content_filter=spamassassin
#submission inet n       -       -       -       -       smtpd
#   -o content_filter=spamassassin

spamassassin unix -     n       n       -       -       pipe
  user=debian-spamd argv=/usr/bin/spamc -s 2048000 -f -e /usr/sbin/sendmail -oi -f ${sender} ${recipient}