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Creating additional SMTP port in Plesk


Normally SMTP port in plesk uses port 25 for mail access.

If required you can switch the SMTP port to an alternative port . For this you can use the following steps.

1) Login to the server as root.

2) Open the file /etc/services to find out an unused port.

Considering port 126 is unused & smtp2 is the service,  you can make following changes in the file.

smtp2 126/udp mail

smtp2 126/tcp mail

Save the file.

3) Now copy the file /etc/xinetd.d/smtp_psa to /etc/xinetd.d/smtp2_psa.

4) Open the new file and do the following changes in the file.

Replace the first line “service smtp” with “service smtp2“. The file will look as follows:

service smtp2
{
socket_type   = stream
protocol        = tcp
wait                 = no
disable           = no
user                 = root
instances       = UNLIMITED
env                   =  SMTPAUTH=1  POPLOCK_TIME=20
server             = /var/qmail/bin/tcp-env
server_args  = -Rt0 /var/qmail/bin/relaylock /var/qmail/bin/qmail-smtpd /var/qmail/bin/smtp_auth /var/qmail/bin/true /var/qmail/bin/cmd5checkpw /var/qmail/bin/true
}

5) Now restart xinetd service.

[root@server~]#/etc/init.d/xinetd restart

6) In order to check if the new port is listening you can issue the following command.

[root@server~]# netstat -tlpn|grep :126

tcp 0 0 0.0.0.0:126 0.0.0.0:* LISTEN 1245/xinetd

7) Also you can check functionality of port 126 by issuing following command.

# telnet XX.X.XX.XX 126

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