Parallels

Symptoms

Mail message submission was enabled through Server -> Mail -> Enable message submission, but submission port is still closed:

Cause

Since version 8.3 Plesk qmail creates xinetd configuration file /etc/xinetd.d/submission_psa (for RedHat OSes) or adds the appropriate record into /etc/inetd.conf on Debian and FreeBSD.
Fresh installation means clean installation of Plesk Control Panel 8.3 or above on server or upgrade from older versions.

Control Panel option Enable message submission just comments the record out in inetd.conf or renames submission_psa to submission.psa to exclude submission from xinetd configuration. Reinstallation of package psa-qmail would not restore the missing records.

Resolution

You should create the file or add the record manually.

/etc/xinetd.d/submission_psa
service submission
{
socket_type = stream
protocol = tcp
wait = no
disable = no
user = qmaild
instances = UNLIMITED
env = SUBMISSION=1 SMTPAUTH=1
server = /var/qmail/bin/tcp-env
server_args = /var/qmail/bin/qmail-smtpd /var/qmail/bin/smtp_auth /var/qmail/bin/true /var/qmail/bin/cmd5checkpw /var/qmail/bin/true
}

/etc/inetd.conf
submission stream tcp nowait qmaild /var/qmail/bin/tcp-env tcp-env /usr/bin/env SUBMISSION=1 SMTPAUTH=1 /var/qmail/bin/qmail-smtpd /var/qmail/bin/smtp_auth /var/qmail/bin/true /var/qmail/bin/cmd5checkpw /var/qmail/bin/true