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Mail messages are not delivered

Dinara Aspembitova

Updated February 23, 2018 22:58

Applicable to:

Plesk for Linux

Symptoms

Mail messages are not delivered;
25 port is listened by sendmail utility:
# netstat -tlpn | grep :25
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 27580/sendmail: MTA

Cause

Port 25 is used by another process.

Resolution

Connect to the server via SSH.
Find out the process of sendmail:
# ps aux | grep -v grep | grep sendmail
root 27580 0.0 0.1 78084 3052 ? Ss Jan28 1:34 sendmail: MTA: accepting connections
Kill this process:
# kill -9 27580
Restart Postfix:
# service postfix restart

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