Wesley Levels's Blog

Noticed some strange behaviour with “Send As Permissions” on my Exchange 2007 server. I couldn’t get the send as permissions to work. After doing some research, I found some known problems, that I will list in this post:

- To apply a user “Send As” permissions, the user also needs to have “Send on behalf” permissions on the mailbox.
- A mailbox that is hidden from the Exchange Address List can’t be used for a user to “Send As”.
- Exchange updates its permissions like “Send As” permissions every 120 minutes only. This means it could take 2 hours before your “Send As” permissions are configured. There are people saying that an Information Store restart would force the update of permissions, however there is no proof that this works.

Because most people today use Outlook 2007 with cached RPC over HTTP, the “Exchange Address List” won’t be updated directly when creating new users. This also means it’s not directly possible to use the newly created mailbox to send as this mailbox. Turning of caching will show up the newly created mailbox and enable the functionality to send as this mailbox.