When sending emails to certain domains to youget an error stating #450 4.7.1 Client Host Rejected Cannot Find Your Hostname ##. This is a reverse lookup error.
Had an issue where a clients Exchange 2007 server`s Microsoft Exchange Transport service would continuosly stop with the error message as seen below in the application log in event viewer. Faulting application edgetransport.exe, version 8.1.340.0, time stamp 0x4923d0d8, faulting module ESE.dll, version 8.1.329.0, time stamp 0x48ec753c, exception code 0xc0000005, fault offset 0x0000000000086db0, process id 0x%9, […]