Exchange_wildcard_rewrite is a project mainly written in C#, it's free.
Rewrites e-mailaddresses with wildcards (e.g. test*@mycompany.com) to a specified e-mailaddress.
NOTE: This is a work-in-progress. At this moment it isn't usable!
Adds wildcard support to your Exchange 2007 server. This hook gives you the option to define e-mailaddresses with wildcards and rewrite them to another e-mailaddress.
So now you can say that all mail addresses to test*@mycompany.org has to go to [email protected]