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I have running exchange server....every thing was going fine, however last two days I cannot receive any external emails from outside the network, while I can send/receive internally and send to external address too....

when I tried to send email from gmail I got the following error:

Delivery to the following recipient has been delayed:

 ***@***

Message will be retried for 1 more day(s)

Technical details of temporary failure: DNS Error: Address resolution of *****.dyndns.org. failed: Domain name not found

And the message never received...

Telnet output:

220 MAIL.****.** Microsoft ESMTP MAIL Service ready at Sun, 8 Mar 2015 09:31:16 +0400

1 Answer 1

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Did you read the error message?

Address resolution of *****.dyndns.org. failed: Domain name not found

The DNS entry for your host does not exist. Log into your DynDNS account and fix it.

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