I ran into an issue that I just cannot figure out. We have several shared mailboxes that multiple users need "full access" as well as "send as" permissions on. The way we control the permission is we have the mailbox which I will call "mailbox" and group with I will call "mailbox.group"
Once "mailbox" was set up we added "mailbox.group" to the "full access" and "Send as" permission and added the users to the group. This made it very easy to keep control over who had access by copying AD accounts for new users, etc.
When this was first set up we were on Exchange 2003. We migrated to Exchange 2010 almost 3 years and it has always worked perfectly. We were still able to add and remove user of the group.
Last week we added a new SMTP alias to the mailbox and made it primary. Right after that the groups stopped working. We can add a user to the send as permissions and it works but adding the user to the group does not. I have checked the security setting on the group and they appear to be correct but I could be missing something easy (I hope I am).
Any input would be greatly appreciated.