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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