I am having a nice "discussion" with 2 of my clients, who don't know each other by the way. They both run exchange servers for their mail and both of their IT people that set up their mail servers say that I, as their host, must create rdns for their IP because they are having problems e-mail some ISP who do a reverse lookup.
I have changed the MX to go to exchange.domain.com and added an A record that points exchange > their IP. This is all I have ever done and it seems to work for those few clients that have their own excahnge server.
As an example the one client uses Charter for internet and the IP they gave me is a Charter IP such as (68.115...). My question is since Charter is the authority for that IP, doesn't Charter have to do this? To set up a PTR to 68.115... for exchange.domain.com.
I am talking to 2 different IT people who know much more than I do, but I've never done that for any of my other clients. Unfortunately, I only have 6 or so that use their own mail servers so I don't deal with this frequently enough to know that much about it.
Any help would be greatly appreciated.