PTR on Exchange 2010 with GFI
Posted on 2014-01-23
Guys - retiring a T-1 ISP account as our primary WAN. We were using another ISP for WAN2 just for browsing, etc. Now WAN2 is our primary and ONLY ISP on the router. Public static IP's, etc. all the normal stuff.
Exchange 2010 server in house within the LAN. Cisco RV042 primary router with ONLY a WAN1 in use now on a static IP.
In the old days we did have a PTR thru our carrier on the T-1. Not sure if it is required anymore and if we need to re-load the same action on the new carrier, but for a different IP/A record. My main question is whether we need to do this at all. If YES, the next really important question is whether it should be the MX address (i.e. - our GFI cloud filtering) or simply the WAN IP on our router which mail passes in and out of now.
We use GFI in a cloud datacenter for all inbound filtering. Trying to confirm if we actually ever setup outbound filtering but not 100% sure yet. If yes, and possibly even if no, I am thinking a PTR record may need to be our inbound MX record on our DNS provider so that reverse DNS lookups would match vs. just seeing our public WAN IP. The bottom line is PTR or no PTR. Then if yes on PTR, should it match our MX inbound records for reverse DNS match or actually make it the WAN IP in front of the mail server? Seems like it would be MX record match vs. WAN IP.
Anyone have any questions, don't hesitate to post. Trying to get this perfect to avoid issues but more importantly burn in the process going forward in our KB.