Trying to setup an Exchange 2013 server, with the DC and Exchange on same machine. WHen I try to deliver for either of the 2 mailboxes I have setup, I get this error.
The server returned status code 451 - Error in processing. The server response was: 4.7.0 Temporary server error. Please try again later. PRX3
It doesn't seem to be a resource issue (I'm running an XL instance on Azure), and all other connectivity works fine (and fast). I just can't receive email there.
Looking in the event logs, I saw one issue related to the Front End HTTP proxy, but I wouldn't assume that's relevant here. (And connectivity via Outlook & OWA seem to be fine, with the exception of some redirect issues on the latter).
I did end up installing Exchange on a secondary drive for space considerations, so the location is different... not sure if that would factor in either.
Any ideas? I don't even really know where to start debugging this. I'm trying to set this up to work on some event sync/forwarding code.