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exchange 2010 451 Recipients not all at same mail host - psmtp

Posted on 2014-03-21
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Last Modified: 2014-04-29
I am trying to send mail to 2 mail recipients  to the same domain.  It is failing:
20 Mar 2014 00:12:07 [0x000003ac] - ROUTER: <<<< 451 Recipients not all at same mail host - psmtp
20 Mar 2014 00:12:07 [0x000003ac] - ROUTER: Error sending RCPT-To: 451 Recipients not all at same mail host - psmtp (will retry...)

If I send the mails as two separate mails each mail goes thru.

I think there is a setting in exchange that will send the email as separate mail to multiple users at the same domain instead of multiple TO:s.
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Question by:amcotech
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by:EEhotline
ID: 39946603
It sounds like Postini is causing this.

Ref link:
https://support.google.com/postini/answer/139512?hl=en
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Author Comment

by:amcotech
ID: 39950556
I understand Postini is causing this.  I cannot do anything about someone else's mail server.

I think there is a setting in exchange that will send the email as separate mail to multiple users at the same domain instead of multiple TO:s. DO you know where this is?
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Accepted Solution

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Jian An Lim earned 500 total points
ID: 40016331
there is no such configuration  from exchange 2010/13.
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