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550 5.1.1 RESOLVER.ADR.ExRecipNotFound

Hi all,

One of my clients runs SBS2008 with Exchange 2007... One of the employees has multiple mailboxes, all but one of these domains the server is authoritative for, however one isn't and that particular domain address he receives emails forwarded from another server to him (external and not part of the company network in any way), he can also send using that address, out through their exchange server no problem BUT if he tries to copy himself with that address it immediately bounces with the following error:

Delivery has failed to these recipients or distribution lists:
 
The recipient's e-mail address was not found in the recipient's e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system administrator

#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##


To complicate things slightly, this address also happens to be his default email address for his exchange account as well, i.e. when he sends an email outlook will always use this address as default (unless of course he chooses a different one manually)...

Any ideas..??
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ServTech
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ServTech
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1 Solution
 
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
2 Accounts should have the same Email address .... this will confuse Exchange so please change for Secondary or whatever the other account is

- Rancy
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ServTechAuthor Commented:
Sorry I don't understand..?
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
You said

To complicate things slightly, this address also happens to be his default email address for his exchange account as well

Only one Account should have a unique Email address if not it will confuse Exchange and through an NDR thats what its doing .... so change the Email addresses to be Unique

- Rancy
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ServTechAuthor Commented:
He has four mailboxes in exchange, these mailboxes each have a unique email (and domain) address.

Three of them, the server is authoritative for, the fourth it is not (the domain is registered to another server and email gets forwarded from that server)...

That particular email address (and domain) that the server is not authoritative for, happens to be the one that he uses as his default exchange mailbox and default email address...

Any ideas why the emails he copies himself on (with the default email address) bounce immediately..??  If he just sends from that address, there is no problem... it's only when he copies himself..??
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Maybe cause it cant understand try from a different ID, does all work fine

- Rancy
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ServTechAuthor Commented:
This is hard Work.!

"Can't Understand" what exactly..??  "Different ID" why..??

Anyone else have any ideas please..?
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Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
Even though this article is written about Office365, it applies to your issue:
http://support.microsoft.com/kb/2784785/

The underlying cause is that the stored x.500 address is what "copying to himself" is trying to send.  x.500 addresses are not routed via DNS, they route through Active Directory, and since your AD has no relationship or other references to that external domain, the email fails.

So, follow the resolution steps in that article and make sure he deletes any cached entries for his own email address -- then have him try sending to himself again and it should go through because it will now read the actual .com domain name instead.

I believe that if you had posted the "Generating Server Name" part of the NDR message in your original question, it would have been more obvious.

Jeff
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