Exchange 2013 Public Folder "Send As" Permissions

We have an exchange 2013 server setup with two domains. is the primary and is a secondary domain. All mail routing etc works and we have a few users that have as the primary email address.

The issue I am having has to do with public folders send as permissions. We have a PF named info and it is mail enabled. The email addresses attached are and the primary address is the address. When I give a user send as permissions to this folder they can only send using the address. I get the error:
You do not have the permission to send the message on behalf of the specified user. Error is [0x80070005-0x0004dc-0x000524].

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When using the address. Do any of you have any idea why this is and do I have to do something to allow this?
Thomas WheelerAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
This seems very strange and you should only be able to Send As the Primary SMTP Address (if you have proper permissions). This seems like a caching issue. Have you tried to do this with the Outlook client in Online mode rather than cached mode?

Also have you tried to check the primary smtp to and then back to


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Thomas WheelerAuthor Commented:
I don't think it's a caching issue as I can update the send as permissions on a different folder and it's instant. But I can give it a try. I have changed the primary address back and forth and get the same result
Thomas WheelerAuthor Commented:
you are right this seems to be a cache issue. If I disable the cache I can send as but if I re-enable it I can only send if the primary address is set to Do you know how to update the cache so this will work?
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Thomas WheelerAuthor Commented:
Thanks. that worked if I disable the cache.
Will SzymkowskiSenior Solution ArchitectCommented:
ok cool. So that means its either the OST file or the Outlook profile. Likely the OST if you just needed to disable cached mode.

Thomas WheelerAuthor Commented:
it's strange I tested on a few machines and it works if I disable caching but I want to use caching. It seems silly that I would have to create a new profile everytime I make permission changes. Is there a way to get this to update with out doing that?
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