Exchange 2007 and 2013 coexistence SMTP problem. 451 5.7.3 Can not archive Exchange Server authentication
Hi, I'm migrating from Exchange 2007 SP3 to Exchange 2013 SP1 RU15 CU8.

I installed two Exchange 2013 servers with the Client Access and Mailbox roles.

I can send mail from Exchange 2007 mailboxes to Exchange 2013 mailboxes, but I can not send mail from Exchange 2013 mailboxes to Exchange 2007 mailboxes.

The emails are queued, with the following error message queues Exchange 2013 servers:

Last Error
451 4.4.0 Respond Prymary target IP address with: "451 5.7.3 Can not archive Exchange Server authentication." Attempted failover to alternate host, but That did not succeed. Ether there are no alternate hosts, or delivery failed.

Delivery Type:
SMTP relay mailbox delivery group

How I can fix it?

regards
May 7th, 2015 3:46pm
Hello, I've solved the problem, I applied the following article:
https://support.microsoft.com/en-us/kb/979175?wa=wsignin1.0

In Exchange 2007, the default connectors not have the Exchange Server authentication method, I selected the option and restart the shuttle Exchange 2007 servers and all right

regards
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May 7th, 2015 5:21pm

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