Exchange 2007: Accept mail for unresolved recipients and forward to CatchAll-Mailbox

Posted on 2007-10-18
Last Modified: 2009-02-04
I need Exchange 2007 to accept mail to unresolved recipients and send it to a dedicated internal mailbox.  I can find workarounds for this problem for earlier versions of Exchange, but not for 2007. Except a hint that this can be achieved by writing your own transport agent, but there is little info on how to do this (actually I did not have in mind to do this, but as a last line of resort...).

- In the target environment the exchange server is installed with all roles on the same server hardware.
-  I am aware of the (security related) side effects of accepting mail regardless of recipient existence, still it shall be done (during a migration period).
- We're migrating to Exchange, so my understanding of Exchange is not too deep (yet)...

Any help appreciated, thanks for listening !
Question by:sagy_ee

    Expert Comment

    what do you mean by unresolved recipients?

    Author Comment

    I mean incoming mails which Exchange cannot assign to existing users.

    Let's say our organization has two mail-enabled users "" and "", and user "" has an additional mail alias "" registered with exchange. Exchange will deliver mail exactly to these 3 addressees and reject mail to any other (unkown, unresolvable, unresolved...) recipients like "", by default it will send a rejection message to the sender if my understanding is correct.

    I want Exchange to accept such mail, to not send back a rejection message and to deliver that mail to one dedicated internal mailbox, let's say to "". I call this mailbox the "CatchAll" mailbox.

    Accepted Solution

    I was able to solve this now: Wilbert de Graaf has compiled a perfect solution for this, and timely too:

    I guess he is the one who deserves the points then... ;-)


    LVL 1

    Expert Comment

    Closed, 500 points refunded.
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