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 as root

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

Add the below lines

smtp_psa_new 26/tcp mail
smtp_psa_new 26/udp mail

root# cp smtp_psa smtp_psa_new

Change the service line in the new file “smtp_psa_new” to be this:

service smtp_psa_new
{
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# /etc/init.d/xinetd restart

And you should see smtp listening on ports 25, and 26:

root# netstat -anp | grep xinetd
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 6989/xinetd
tcp 0 0 0.0.0.0:26 0.0.0.0:* LISTEN 6989/xinetd

That’s it!

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On your plesk dedicated server you already have qmail as your mail server and now you’re looking to manage the qmail message queue. qmHandle is the simple program for this.

Install qmHandle on plesk dedicated server using the below steps:

Login to the sever as root.

Download the tar from here using the following command:

root# wget
http://jaist.dl.sourceforge.net/sourceforge/qmhandle/qmhandle-1.3.2.tar.gz

root# tar -zxvf qmhandle-1.3.2.tar.gz

root# chmod 755 qmHandle

root# ./qmHandle –h

Few commands of qmhandle :

List help for qmhandle commands.

qmHandle -h

Show statistics for qmail mail queue

qmHandle -s

Deliver all mails in mail queue.

qmHandle -a

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On a plesk server I could not connect to ftp so when I checked the logs I found

- warning: unable to determine IP address of ‘myhostname.server.com’
- error: no valid servers configured
- Fatal: error processing configuration file '/etc/proftpd.conf'

Then, I checked the /etc/hosts and found hostname entry missing:

[root]# cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1       localhost.localdomain   localhost

So to get this fixed I added the below entry in the /etc/hosts file

xx.xx.xx.xx   myhostname.server.com

And, then restarted xinetd which fixed the issue.

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While working on a windows 2003 server which has a plesk 8.4 control panel, I got the following error:

Unable to add ip xx.xx.xx.xx with mask 255.255.255.0 to interface PublicNetwork, WMI error code 42
Execute file name: C:\Program Files\SWsoft\Plesk\admin\bin\ifmng.exe

This means that there is an IP conflict, to get this fixed – you have to contact your dedicated server provider and ask them to remove the IP address or to provide a new IP address.

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