Article ID: 116748, created on Aug 13, 2013, last review on May 10, 2014

  • Applies to:
  • Plesk 11.0 for Linux


Parallels Premium Outgoing Antispam is not starting on Debian/Ubuntu server with Postfix MTA. Error in Plesk interface is displayed:

Protection : Not active. There are some problems that prevent the service from being started.

Postfix milter configuration contains the following:

~# grep milter /etc/postfix/
smtpd_milters = inet:localhost:12768 unix:/ctmilter/ctmilter.sock
non_smtpd_milters = inet:localhost:12768 unix:/ctmilter/ctmilter.sock

and ctmilter_initd service fails to start:

~# /etc/init.d/ctmilter_initd start
ERROR: Process ID list syntax error.
Starting ctmilter deamon
running ctmilter from /opt/ctch/ct-milter
User doesn't exists: postfix
chown: cannot access `/var/spool/postfix/ctmilter/ctmilter.sock': No such file or directory


  1. Edit /etc/nssswitch.conf, change compat to files:

    passwd:         files
    group:          files
    shadow:         files
  2. If directory /var/spool/postfix/ctmilter doesn't exists, create it:

    ~# mkdir /var/spool/postfix/ctmilter
    ~# chmod 755 /var/spool/postfix/ctmilter
  3. Edit /etc/postfix/ and change:

    smtpd_milters = inet:localhost:12768 unix var/spool/postfix/ctmilter/ctmilter.sock
    non_smtpd_milters = inet:localhost:12768 unix var/spool/postfix/ctmilter/ctmilter.sock


    smtpd_milters = inet:localhost:12768, unix:/var/spool/postfix/ctmilter/ctmilter.sock 
    non_smtpd_milters = inet:localhost:12768, unix:/var/spool/postfix/ctmilter/ctmilter.sock


ctmilter settings were not configured properly, most probably it was installed together with another anti-spam solution.

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