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We have a Windows 2008 Enterprise R2 SP1 server with multiple accepted domains configured on our Exchange 2010 console.

Configuration of exchange 2010: In exchange console, under organization configuration > hub transport > accepted domains, we have:

domain1 > authoritative > default = true
domain2 > authoritative > default = false
domain3 > authoritative > default = false
domain4 > authoritative > default = false

We are able to RECEIVE e-mails on ALL the above domains.

Just to be clear: I can receive emails to ,, and without any problems. I am able to send email from (the default domain). However, when trying to send emails from,, and, I receive the following error:

Delivery has failed to these recipients or groups:

destination_example_email You can't send a message on behalf of this user unless you have permission to do so. Please make sure you're sending on behalf of the correct sender, or request the necessary permission. If the problem continues, please contact your helpdesk.

If I change the primary email address for userX to , I am able to send as and only from that mail.

The question:

How can I enable sending emails from ALL the authoritative domains at any single moment without having to manually change the default email address of the user?

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I would also like an answer to this topic. – Fase Feb 6 '12 at 21:58

We've found a work-around in the meanwhile.

If we split up the accounts into 4 different accounts, and grant the correct permissions, we are able to send as any user.

However this is a very pale solution. this would multiply the number of accounts in both AD and Exchange

Still searching for a official fix on this.

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As far as I am aware each mailbox can have only one primary email address, this is the reply address the recipient will receive, even if each mailbox has multiple alias email addresses.

I would create a mailbox for each domain. Then give the user full mailbox access to the, and mailboxes, and add these as additional mailboxes in the Outlook profile.

When the user sends an email they will then be able to choose each the relevant email addresses from the from field.

To complement this I would set an autoforward from the additional domains to the mailbox so the user doesn't have to check each mailbox.

It's not a perfect solution but will do the job.


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