Send As permissions - Exchange 2010

We have a strange issue that has popped up for us.

We had a few users request a certain email address that they could send from. For example AR@company.com or AP@company.com

We created those emails in exchange 2010 and gave send as permissions to the users that wanted it. However, when they try to send as one of those email addresses, they get an immediate bounce back saying they do not have permissions to send as. However, it works fine in OWA, and if you create a new outlook profile, it works fine, till the next morning. I'm assuming maybe it's a OAB issue since the OAB gets downloaded nightly.

I don't see any errors / issues in the event logs. Not really sure where to go from here.

Anyone have any insight?

Little background: We migrated from exchange 2003 to 2010 about a year ago.
Users are using outlook 2007 or outlook 2010.
Exchange 2010 is installed on a server 2008 standard VM.
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themightydudeAsked:
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themightydudeAuthor Commented:
I figured it out.

Was thinking it was an OAB problem initially as well, but it worked fine if we deleted the OAB, then when the OAB re-downloaded later, it would stop working.

The issue actually ended up being that a while back someone had decomissioned our pimary DC, and installed a new one, but when they did, they forgot to change the primary DNS on the exchange server to point to the new one, and it was still pointing to the old as primary and then pointing to our secondary DNS, but our secondary DNS just pointed back to it'self, so it was kind of broken in that aspect lol.

I fixed DNS on the secondary DNS and the exchange server and it's working fine now.
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AmitIT ArchitectCommented:
Make sure these users are not part of any protected group in AD. Also check admin count value for these users via using adsiedit tool. If it is 1, that means they are part of protected group and permission will be revoked automatically by AD.
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themightydudeAuthor Commented:
But they can send from OWA just fine..if they were part of a protected group then it shouldn't work in OWA either correct?
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AmitIT ArchitectCommented:
Ya that is correct. But can you check admin count value for one user.
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themightydudeAuthor Commented:
Checked for one of the users having this issue and admin count is not set.
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themightydudeAuthor Commented:
I should mention as well that I can do a send as from one of the accounts, but not from the other.
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James HodgeManaging DirectorCommented:
Hi Mightydude,

I've had this before.

1) Outdated Cached Contact Information (*.Nk2)
You could right click and delete the problem addresses or delete the whole list.
Here is some info: http://windowsitpro.com/outlook/outlook-2010-autocomplete-cache-and-suggested-contacts

OR

2) OAB Problem
Delete the offline address book folder under “C:\Users\username\AppData\Local\Microsoft\Outlook\Offline Address Books”  (if Windows 7?). Then open Outlook and force a download of the new OAB.

James
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themightydudeAuthor Commented:
fixed
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