Plesk 7.5, See PDF page 22. (document page 18) entitled "Managing Domain DNS Zone Records"
URL: http://www.swiftinter.net/plesk/75reloaded/plesk-7.5r-domain-users-guide.pdf
Plesk 8.x, See page 41. Customizing DNS Zone Configuration for Your Domain"
URL: http://www.swiftinter.net/plesk/81linux/plesk-8.1-unix-email-users-guide.pdf
1) Find out both the IP address and domain name of the mailserver from the client.
2) If the domain name of the mailserver is a sub-domain of the domain on your server, then add it to the DNS as an A record, pointing it to the IP address of their mailserver.
e.g. smtp.domain.co.uk 123.123.123.123
If however the mailserver is a third party domain. e.g. smtp1.messagelabs.com then skip this step and go to 3.
3) Add the domain name of the mailserver as an MX record with high priority, and delete any other MX records.
Now go to the MAIL section of the control panel for the domain in question, and disable local mail by clicking the "Disable" button.
The change may take upto 24 hours to update through the DNS, so it's usually best to make this sort of change at the end of the working day so that it updates overnight.
Testing.
the changes may be tested using www.dnsstuff.com
a) "DNS Lookup" on http://www.iptools.com/ for MX records will show the MX records for the domain.
a) "Email Test" on http://4dnstools.com/ will simulate a test message to the mailserver.
Ask the client to test the email to their satisfaction and to let you know of any problems. If there are any scripts on the site which deliver mail, then test those also.
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