Send As Permissions

Good Afternoon,

I've got a client using Exchange 2010 on premise.

They want to be able to Send As from multiple addresses without setting up an Exchange account for each address.

They have their primary email address e.g.

I've set up mail enabled security groups for:

And set the permissions to 'Send As' in the Active Directory Admin Centre.

However they keep getting bouncebacks:

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.

Am I missing something?

I followed this guide initially:

Kind Regards,
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Mark BillExchange, AD, SQL, VMware, HPE, 3PAR, FUD, Anti MS Tekhnet, Pro EE, #1Commented:
This setting takes up to 24 hours to kick in, well a sustained period of time usually about 8hrs tell the users 24.

I usually configure it through EMC 2010 send on behalf of permission.

Will SzymkowskiSenior Solution ArchitectCommented:
This setting takes up to 24 hours to kick in
This statment is not correct.

Send As is an AD Permission as you have already set this up using the ADAC. These changes will be replicated to other DC's as well. If you only have 1 AD site then (intra-site replication is almost instant 2 seconds ish). If you have multiple AD sites (inter-site replication) can be anywhere from 15 minutes to 180 minutes (default 3 hours = 180 minutes). It could be longer if you manually set it that way but i highly doubt it.

That being said your Exchange sevrer, depending on what DC it is using may take a few minutes based on replicaiton but if it is in the same AD Site then it should be instant.

However, I have seen issues with Outlook (specifically in cached mode) where Send As permissions do not apply right away. The best way to test this to see if it is a caching issue, is configure Outlook in Online Mode
and try doing a Send As again. That should work, if your AD replication is working correctly.

If that does not work for you then your next step would be to create a new Outlook profile for this user.

And lastly if that does not work then you might have to restart the Information Store Service on your Exchange servers.

I usually configure it through EMC 2010 send on behalf of permission.
This is also false, because you cannot set Send As permissions on Distribution Groups in the EMC. Another thing Send on Behalf of is NOT the same as Send As.

Send As = AD Permission
Send on Behalf of = Exchange Permission


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systemagicAuthor Commented:
Spot on, thanks!
Mark BillExchange, AD, SQL, VMware, HPE, 3PAR, FUD, Anti MS Tekhnet, Pro EE, #1Commented:
sorry will system, made a bad comment here. it was unintentional.

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