I have a customer that needs to setup their reverse DNS. The mail server identifies itself as, for example, abc.com. The Address record for abc.com points to our web hosting server here naturally since we host the web site. They have an Address record of mail.abc.com pointing to their mail server. When BOTNET or other similar rules perform the lookup for reverse DNS, do they consider the Address record at all or is it just important that the mail server IP address resolves to the mail server hostname it identifies itself as?
They are hoping that a PTR record for the IP pointing to abc.com will work. If the Address record is evaluated by taking the hostname of the mail server, then my customer will have to change the hostname to match 'mail.abc.com' I'm afraid :( -- Robert
