The requirements:A company manages numerous events they need to interact with their vendors using the correct domain. eg.. user@some-event.dom, user@someotherevent.dom ...1: easy enough to administer that the company clerk can add a user and the user is setup.The rules:1: no third party software2: no having 90 accounts and 90 mailboxes open in outlook3: no sending with default domain and using reply-to Can this be done in exchange? If so, how? Relevant reading materials appreciated.

In Exchange 2007 Address Rewriting is probably what you want to think about.See the relevant sections in the Help file, downloadable from http://www.microsoft.com/downloads/details.aspx?FamilyID=555F5974-9258-475A-B150-0399B133FEDE&displaylang=enI haven't taken time yet to explore Address Rewriting in Beta 2 but I wouldn't expect it to be a task for a "company clerk". I think you may also have problems with your "rules" too.When you saw that you want the company clerk to create a "user" I assume you mean a new user in (probably) a new domain. Is that correct?Others may be able to give you a more specific answer but I notice that you asked your question about 3 days ago.Andrew Watt MVP