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EHLO options between current server and proxy target do not match : Xrdst. Critical non matching options : Xrdst. Failing over.

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I'm running Exchange 2103, I have two CAS severs and 5 mailbox servers. On my cas servers I receive the following errors in my SMTP SEND Logs:

EHLO options between current server and proxy target do not match : Xrdst. Critical non matching options : Xrdst. Failing over.

The above error occurs on 3 of the 5 mailbox servers. Due to this error all mail is relayed through the 2 mailbox servers.

Any help would be appreciated.


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