Outlook: how do I display the email address in TO:, rather than the account?

I have an exchange mailbox called "Support" with two email addresses: [email protected] (primary) [email protected]

Mail to both addresses goes to the same inbox correctly and message show as To: Support. if I check the details of the To: field it always shows [email protected], even when messages were sent to [email protected]. Viewing the full message headers shows [email protected]

How can I get Outlook to show the actual email address the message was sent to? It's an issue for the people managing the mailbox because knowing what the target address was is important to determine how the message should be handled.

Solution 1:

In the end I gave up on unmangling the address; using a rule on "specific words in the recipient's address" was promising but turned out to be a client-only rule, not practical with multiple users to be co-ordinated.

What I did was create a mailbox for every address, all of them set to forward to the combined mailbox under Exchange General -> Delivery Options. Now when outlook resolves a to: address it finds the mailbox for just that address, and then displays the default address of that mailbox.