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I am trying to set the send as permission for a user account with a Universal security group. It is not working. Does the security group needs to be mail enable? I added the group with EMC but users are still getting an error: <br />
<br />
<b>Delivery has failed to these recipients or groups:</b><br />
<br />
'user email'<br />
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.<br />
<br />
I even put the group full control with EMC with still the same result. When i add a user not a group it is working.
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I am trying to set the send as permission for a user account with a Universal security group. It is not working. Does the security group needs to be mail enable? I added the group with EMC but users are still getting an error: 

Delivery has failed to these recipients or groups:

'user 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.

I even put the group full control with EMC with still the same result. When i add a user not a group it is working.

Send as Permissions Exchange 2010

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