Send as Distribution group with a mailcontact

Hello,
We're having problems to grant a mailcontact (external of our domain) with send as permission on a distribution group. We've tried already through ADUC's security tab...and the problem is that the mailcontact does not appear, so we can't add the send as permission.
Otherwise using the get-mailcontact cmdlet it appears as a mailcontact, and it's listed in the EMC list as well.
Also trying through powershell it seems that won't work with:
[PS] C:\Windows\system32>Add-ADPermission "DistributionGroup" -User "MailContact" -Extendedrights "Send As"
It says:
User or group "MailContact" wasn't found. Please make sure you've typed it correctly.
So I was wondering, how can I especify that it's not a User but a MailContact?
Many thanks in advance!

Hi,
As what Steve says, we can’t give send as permission to a MailContact. As a workaround, I think we can create a mail user with [email protected] account in AD. Then give full access permission with a domain mailbox(UserA) and set
Send As permission to this mail user for the distribution group:
1. Create a Mail User:
http://technet.microsoft.com/en-us/library/bb124381(v=exchg.150).aspx
2. Set Send As permission:
Add-ADPermission "DistributionGroup" -User "MailUser" -Extendedrights "Send As"
3. Assign Full access permission to the mail user to make sure there is a mailbox for this user:
Add-MailboxPermission “UserA” -User "MailUser" -AccessRights FullAccess
Then we can configure the mailbox(UserA) with MailUser account and send as the distribution group in Outlook client:
1. Open Control Panel > Mail > E-mail Accounts > New.
2. In the Auto Account Setup window, fill in the E-mail Account name(UserA) and E-mail Address([email protected]). Then click Next without type Password.
3. Click Finish to close the window.
4. Open Outlook and a Windows Security window would pop-up. Please use MailUser account information(User name: Domain\MailUser and Password) to log into this mailbox.
5. Click New Email > OPTIONS > From, then the From field is shown in the message.
6. Click From > Other E-mail Address, and select the DistributionGroup.
Then this external user can send as this distribution group.
Hope it helps.
Regards,
Winnie Liang
TechNet Community Support

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