I am on SBS 2008 which obviously has Exchange 2007.
I have set a Users mailbox in exchange to allow permission to another User to send and recieve on their behalf
I did this by adding the second User to the " Manage Send As Permission's" and " Manage Full Access Permission's" for First Users Mailbox.
Once I did this all seemed well, "the second User can send emails and recieve for the First User"
Then after probably 5 mins the Second user could no longer send emails for the First User again.
I went back and checked the settings I had setup in " Manage Send As Permission's" and they had been dropped.
I then repeated what I had done originally and added the second User to the First Users " Manage Send As Permission's" mailbox.
Sure enough It continues to drop the settings after 5 mins again.
I am unsure as to how to resolve this problem as I thought that was all I needed to do.
If anyone knows why this is happening and how to fix the problem,
I would be most appreciative.