Ignoring part of e-mail address!

[lionk]

I am looking for a way to ignore the first part of the e-mail address. The idee is that all mail addressed to a particular site is to arrive at the same folder or box without having to create a single mailbox for every possible username. Doing so I'm trying to avoid a lot of administrative work.
Is there any way to this under Exchange?

Many thanks in advance,

best regards,
lionk