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I have a client who needs multiple users to "send as" an existing Mail Contact under Exchange 2010. Is this possible?

I understand how to grant "send as" permissions on a mailbox, but not for a Mail Contact.

Please help?!

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up vote 3 down vote accepted

You can't, because you don't own that email domain.

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What leads you to believe that the mail contact isn't for an address within the domain they own? – Zoredache Dec 18 '12 at 1:15
Ok, maybe a bit of a stretch, but a mail contact is generally an external address outside of the domains for which your exchange install is authoritative. Glad to update if I'm having a brain fart on this one. – HostBits Dec 18 '12 at 1:21
@Zoredache Because if it was for a user or address within their domain it would be trivial to send as that user? – HopelessN00b Dec 18 '12 at 1:36

They can add the send-as permission by editing the contact object via adsiedit or powershell. They need to add the Distinguished name (from the user that needs send-as) to the PublicDelegates attribute of the mail-enabled contact. I would not set this for an e-mail domain that you do not own, as this is a good way to be blacklisted. In my case, I own a different mail domain for SharePoint and users want to send-as the SharePoint site so the return mail is saved on SharePoint.

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