Hi, thank you for reading this. I am working on a migration from Exchange 2007 SP3 RU10 to Exchange 2013. Everything was running fine. I could send email from Exchange 2007 to Exchange 2013 and backwards. Also internet email was comming in just fine. Then I decided to install Exchange 2013 CU3 and that's where my whole Exchange 2013 environment stopt working. After hours of troubleshooting everything is running 'ok' again except for one thing: I cannot receive e-mail on the Exchange 2013 environment. Email is still routed through Exchange 2007 and when I look in the queue on the Exchange 2007 server the following error is shown:
451 4.7.0. Temporary Server error. Please try again later. PRX2
I read articles that this is all about DNS, but I think I tried them all. I thought this would be the easy part after fixing all the other issues. Maybe someone with some fresh pair of eyes can help me out. I just don't see it anymore.
Thanks in advance!
Kind regards,
Baksteen