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I'm currently operating a server, on which runs a mailserver. The mailserver was configured by plesk and it worked fine until those messages appeared in my maillog:

/var/log/maillog

postfix/smtpd[17798]: connect from mail-ig0-f194.google.com[209.85.213.194]
postfix/smtpd[17798]: warning: connect to Milter service inet:127.0.0.1:12768: Connection refused
postfix/smtpd[17798]: NOQUEUE: milter-reject: CONNECT from mail-ig0-f194.google.com[209.85.213.194]: 451 4.7.1 Service unavailable - try again later; proto=SMTP
postfix/smtpd[17798]: NOQUEUE: milter-reject: EHLO from mail-ig0-f194.google.com[209.85.213.194]: 451 4.7.1 Service unavailable - try again later; proto=SMTP helo=<mail-ig0-f194.google.com>
postfix/smtpd[17798]: lost connection after STARTTLS from mail-ig0-f194.google.com[209.85.213.194]
postfix/smtpd[17798]: disconnect from mail-ig0-f194.google.com[209.85.213.194]

Those messages were written when I tried to send a mail (using gmail) to this mailserver. So apparently they can not be delivered because of Milter service which does a connection refusal. Because of that I looked up many ressources in the internet regarding this error, but none of the suggested fixes worked.

As one answer mentios to fix the postfix setting for Milter, here is an excerpt of the current setting:

grep "milter" /etc/postfix/main.cf
smtpd_milters = inet:127.0.0.1:12768
non_smtpd_milters =

Another answer suggests that the free space for partition /var/ might not be enough. But well, it looks good though: 153 GB free space on /var/.

Do you have any suggestion what can be the cause of this error?

Additional system info:

  • Ubuntu 14
  • Plesk 12
  • Postfix 2
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2 Answers 2

Reset to default
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I experienced the same problem with Debian Jessie and Plesk 12.5.30. Solution for me was to start the "pc-remote" service:

service pc-remote start
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0

Start the milter service OR remove inet:127.0.0.1:12768 from smtpd_milters (postfix will not attempt to use it).

Less recomended option is to make postfix ignore milter errors by setting milter_default_action = accept.

http://www.postfix.org/MILTER_README.html

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  • I would preferr the first option, but can not find a source on how to start the milter service. I already tried service postfix restart but the problem still exists.
    – Peter
    Commented Oct 12, 2015 at 14:57
  • 1
    Do you know which particular milter is not started? [There are many different milters]
    – AnFi onet.eu
    Commented Oct 12, 2015 at 17:06
  • No, the only thing I know - is the error message that occurs in the maillog. How to find out what milters can run? Or other suggestions?
    – Peter
    Commented Oct 12, 2015 at 20:28
  • The following command may give you a hint about installed milter packages: dpkg -l '*milter* (It works on Debian)
    – AnFi onet.eu
    Commented Oct 12, 2015 at 23:06
  • sw-libmilter is installed. Now I know the package. Excuse me for the lack of knowledge, but how do I start milter?
    – Peter
    Commented Oct 13, 2015 at 20:43

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