![]() ![]() Check all DNS server entries in the configuration of your network cards (checkĪll network adapters) and make sure not to reference server 127.0.0.1 as DNS server but to use the real IP address instead.There is no list and no documentation on them available.įrom customer feedback we found these ways to solve the problem: It is not quite clear what Microsoft means with this error code and the various PRX-numbers at the end - we've also seen PRX1, PRX3, Exchange then rejects all emails like this. This error message seems to be caused by DNS issues in the Exchange 2013 set up. I have tried the following without results :Įxchange 2013 SMTP error "451 4.7.0 Temporary server error. When doing some checks i will end up with this error :Ĥ51 4.7.0 temporary server error. In my environment i can send/receive mail. ![]()
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