I have Exchange 2010 SP2 facing the following issues :-
1- OWA working very Good also can send and recieve without any problems.
2- MAPI Clients from internal facing the following screen and from outside facing " 5.7.1 Client was not authenticated "
3- some times i face the following screen from google .
the following screens applied on my receive connector
just from 24 HRS i changed my MX record IP also the PTR not updated , Please advice .