How to configure alternate SMTP port OR change the SMTP port on a Plesk server? Sometimes some ISPs block port 25 for security

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reasons in which case, you need to open an alternate SMTP port on your server for your clients. Plesk do not offer a straight forward method of configuring an alternate SMTP port, instead you have to configure it manually.

SMTP on Plesk servers runs under xinetd service and the file resides under /etc/xinetd.d directory. The file for SMTP port 25 is /etc/xinetd.d/smtp_psa. In order to configure an alternate port say for example 2525, follow the below steps:

1. Make a copy of smtp_psa as smtp_psa_new under /etc/xinetd.d/ directory

cp -p smtp_psa smtp_psa_new

2. Edit the smtp_psa_new file and replace the line

service smtp
with
service smtp_new

3. You now need to edit the /etc/services file and make sure the lines with port 2525 should look as follows:

smtp_new 2525/tcp #alternate SMTP port
smtp_new 2525/udp #alternate SMTP port

4. Save the file and restart the xinetd service.

/etc/init.d/xinetd restart

SMTP service will now listen on port 2525 as well which you can verify using the ‘telnet’ command:

telnet yourserverip 2525

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