Article ID: 1374, created on Oct 6, 2008, last review on Oct 12, 2016

  • Applies to:
  • Plesk for Linux/Unix


Mail is not delivered to mailboxes on the server and there is unusual greeting while connecting to port 25 Plesk server using telnet


Port 25 is listened by sendmail service or some other process.


  1. Try to connect to the server (<server-ip> should be replaced with server IP address):

    $ telnet <server-ip> 25
    Trying <server-ip>...
    Connected to (<server-ip>).
    Escape character is '^]'.
    220 domain.tld ESMTP`

    The output may be different if Postfix is used:

    $ telnet <server-ip> 25
    Trying <server-ip>...
    Connected to (<server-ip>).
    Escape character is '^]'.
    220 domain.tld ESMTP Postfix`

    There is server hostname should be reported instead of in the SMTP greeting (Qmail takes it from the /var/qmail/control/me file). If there is another (non-Qmail) greeting, it means that the SMTP port is listened to by another software and that the Plesk SMTP service is not working because of this.

  2. The process that is listening on the 25 port can be found as follows

    # /usr/sbin/lsof -i | grep -i smtp command. 
  3. If this process is xinetd, check if any SMTP service is configured other than psa_smtp. This can be determined using

    # grep smtp /etc/xinetd.d/*
  4. If port 25 is listened to by sendmail or some other process (other than xinetd or postfix), such service should be stopped and removed from autostart.

    Check mail server configuration files:

    #111283 Plesk for Linux services logs and configuration files

Additional information

If you receive one of the following errors, visit:

connection timeout
connection refused

#1388 Can not send an e-mail to Plesk mail server: "connection timeout" or "connection refused"

#125894 Unable to receive/send e-mails

Search Words

mail is not configured

Mail is not delivered

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