You have a plesk dedicated server and having issues related to SMTP port 25. There are issues where ISP blocks SMTP port 25, in this case we can use alternate port (I will use port 26).
Kindly follow the below steps to change SMTP port on your plesk dedicated (linux) server to 26.
Login to your server
Kindly follow the below steps to change SMTP port on your plesk dedicated (linux) server to 26.
Login to your server
root# cd /etc/xinetd.d
root# ls -l | grep smtp*
root# cat smtp_psa service smtp { socket_type = stream protocol = tcp wait = no disable = no user = root instances = UNLIMITED server = /var/qmail/bin/tcp-env server_args = /usr/sbin/rblsmtpd -r bl.spamcop.net
/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
}
root# nano /etc/services
smtp_psa_new 26/tcp mail smtp_psa_new 26/udp mail
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