Apache SpamAssassin in docker

• SpamAssassin is listening over a 783/tcp port.

• chmod 755 /etc/postfix /etc/postfix/main.cf /etc/postfix/dynamicmaps.cf

• /etc/postfix/master.cf example:

  spamassassin host should resolve the IP of this container.

  smtp      inet  n       -       n       -       -       smtpd
    -o content_filter=spamassassin
  submission inet n       -       n       -       -       smtpd
    -o content_filter=spamassassin
  spamassassin      unix  -       n       n       -       -       pipe
    user=nobody argv=/usr/bin/spamc -d spamassassin -p 783 -e /usr/sbin/sendmail -oi -f ${sender} ${recipient}