From: [OWNER]
To: [USER]
Bcc: [ADMIN], [OWNER]
Subject: Domain [DOMAIN] does not point to [HOSTNAME]

Warning!

Domain [DOMAIN], which is listed under our administrative and billing
systems, appears in the list of local domains of server [HOSTNAME],
but is pointing to the external IP [IP].

This is a wrong situation which should be fixed as soon as possible,
as it can lead to serious problems, including the lost of legitimate
email addressed to your domain.

Please modify the name servers of domain [DOMAIN] so they start
pointing back to the server. The name servers should be the following:

[NAMESERVERS]

This is a security warning and must not be ignored. Should you require
further assistance, please contact [OWNER]

Regards,
-- 
System administration
[OWNER]