I manage many different systems and can fix a lot of things, but Exchange is not one of my strong suites. In Exchange 2007 the message header is sending the local domain name "server.domain.local" instead of "mail.domain.com". Gmail is rejecting all email now. I thought it was fixed last month and it used to work all the time. I know that reverse DNS is part of my problem and that is being resolved, but I need the header to say mail.domain.com instead of server.domain.local.

**How exactly do I change this in Exchange 2007?**

Step by step or a link that will show me step by step is preferred to "oh you just edit the (insert cryptic procedure here)"

Here is what I receive back from gmail:

```
mx.google.com #550-5.7.1 [...] Our system has detected that 550-5.7.1 this message does not meet IPv6 sending guidelines regarding PTR 550-5.7.1 records and authentication. Please review 550-5.7.1 https://support.google.com/mail/?p=IPv6AuthError for more information 550 5.7.1 . t25si2410247ott.54 - gsmtp ##
Original message headers:
Received: from SERVER.domain.local ([...random hex stuff...]) by
 SERVER.domain.local ([...random hex stuff...%10]) with mapi; Wed,
 11 Jan 2017 09:26:00 -0600

```