How to speed up sending emails in Plesk

I am running Plesk for Linux and I've noticed that emails are sent very very slow. As a result, emails are delayed..

I was able to research a fix to at least speed up the sending of emails in Plesk.

Login thru SSH and go to /etc/xinetd.d and edit the smtp_psa file.

The file should look like this:
------------------------------------------------------------------------------------------------------
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 -r cbl.abuseat.org -r sbl-xt.spamhaus.org /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
------------------------------------------------------------------------------------------------------

you are going to do is, add "-Rt0" (minus the quotes" ") to "server_args" so it will look like:

server_args = -Rt0 /usr/sbin/rblsmtpd -r bl.spamcop.net -r cbl.abuseat.org -r sbl-xt.spamhaus.org /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


Save the file, and restart xinetd:

/etc/init.d/xinetd restart

This should help speed up the sending of emails in Plesk.