Undeliverable Email when Sending As

I have an EU that is getting the following message sent to him when he attempts to send as from a shared mailbox:

"You are not allowed to send this message because you are trying to send on behalf of another sender without permission to do so. Please verify that you are sending on behalf of the correct sender, or ask your system administrator to help you get the required permission. "

I think this related to a setup in the Outlook Client, but can't figure out where to make the change.

Any help would be appreciated.

March 3rd, 2015 3:08pm

Hi,

Based on the error message, I think it's a permission issue.

It seems the user who is trying to send the message does not have "Send on Behalf" permissions or "Send As" permissions to the mailbox. Please confirm this, grant the user the proper permission if he doesn't have it.

Set the user as a delegate automatically receives "Send on Behalf" permissions. For example, to designate a user as the delegate in Outlook 2010, follow these steps:

  1. Click the File tab, click Account Settings, and then click Delegate Access.
  2. In the Delegates dialog box, click Add.
  3. Type the name of the person whom you want to designate as your delegate, or search for and then click the name in the search results list.

    Note The delegate must be a person in the Microsoft Exchange global address list (GAL).
  4. Click Add, and then click OK.
  5. In the Delegate Permissions dialog box, accept the default permissions settings or select custom access levels for Exchange folders.
  6. To send a message to notify the delegate of the changed permissions, click to select the Automatically send a message to delegate summarizing these permissions check box.
  7. If you want to grant additional permissions for the delegate to view private items, click to select the Delegate can see my private items check box.
  8. Click OK two times.

If the user needs the "send as" permission, you may need to do it on Exchange. If you have any questions about granting the user "send as" permission, you can post a question in Exchange forum:

https://social.technet.microsoft.com/Forums/office/en-US/home?category=exchangeserver

Regards,

Melon Chen

Forum Support

Free Windows Admin Tool Kit Click here and download it now
March 4th, 2015 2:50am

Melon,

Thank you for the reply.  The person, according to our exchange team, has been given Send As Permissions.  The error message tells me that the Outlook Client is attempting to send the email as a Send on Behalf of type email instead of Send As Email. 

I had this issue in the past, and it is a setting on client side; however, that was a long time ago and several versions ago.

March 4th, 2015 11:15am

Hi,

To check whether the permission has been granted properly, we can do a test.

Please let the user logon OWA, check if the issue persists when he tries to send on OWA.

1. If the issue occurs on OWA as well, please let your Exchange team check the permission again, possibly they will need to re-add the permission.

2. If the issue doesn't occur on OWA, then we can say it's an Outlook client related issue.

You mentioned it was a setting on client, could you please let me know what it was?

I suggest you exit Outlook first, then rename your current data file(.ost) to ".old", then Outlook will generate a new one to sync the next time it starts, check if the problem persists.

Regards,

Melon Chen

Forum Support

Free Windows Admin Tool Kit Click here and download it now
March 5th, 2015 2:03am

Hi,

Just checking in to see if the information was helpful. Please let us know if you would like further assistance.

Regards,

Melon Chen

Forum Support

March 8th, 2015 11:01pm

Hi,

I'm marking the reply as answer as there has been no update for a couple of days.

If you come back to find it doesn't work for you, please reply to us and unmark the answer.

Regards,

Melon Chen

Forum Support

Free Windows Admin Tool Kit Click here and download it now
March 11th, 2015 9:08pm

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