Our exchange server is getting disconnected by other servers recently, here is an example:
554-Your access to this mail system has been rejected due to the sending MTA's f
ailure of the following host DNS verification measures:
554-1) The host PTR record doesn't exist in DNS (there's no hostname associated
with the connecting MTA's IP address)
554-2) A reverse DNS lookup of the connecting MTA's IP address (PTR) does not ma
tch the forward DNS lookup (A Record) of its hostname.
I've checked and my DNS and reverse appear to be working ok (mail.nativeconnections.or
g 220.127.116.11). I used http://mxtoolbox.com/SuperTool.aspx
to check my server and get a "banner doesn't mach rDNS" error. But it does, what am I missing?