Cannot send/receive mail in Plesk: Milter service inet:127.0.0.1:12345: Connection refused

Symptoms

• Email messages cannot be sent or delivered with the following error messages can be seen in the /var/log/maillog:

  CONFIG_TEXT: postfix/smtpd[1742]: warning: connect to Milter service inet:127.0.0.1:12345: Connection refused

Cause

MagicSpam was removed however Postfix configuration file /etc/postfix/main.cf contains the following :

CONFIG_TEXT: smtpd_milters = , inet:127.0.0.1:12768 inet:127.0.0.1:12345

Resolution

1. Connect to the server via SSH

2. Remove the milter leftovers from a postfix by executing the following commands:

   # postconf smtpd_milters = , inet:127.0.0.1:12768
   # service postfix restart