451 4.7.0 Temporary server error. Please try again later. PRX2" error when receiving SMTP mail.
does anyone know exactly what causes this error? there are many references to it on the web, but nobody seems to know exactly what causes it. maybe it's something to do with DNS?
can someone please ask someone on the exchange team to help document this?
- Edited by spongman Saturday, January 12, 2013 7:40 PM