keeping two email servers in sync

This might be the wrong list for this question, but it might
be related to maildrop.

I have two email servers which I would like to keep in sync
all the time.  The messages should be available on both at the
same time.  Initially I though of using rsync by having it syncing
from A to B, and 2 minutes later syncing from B to A.  This seems
to fail because messages start appearing as duplicates.  Syncing
one way only avoids the duplicates, but fails to make sure that
both servers contain the set of messages.

Anyone as knowledge if maildrop can be used to perform this 
function correctly?  Is there any other option?

Thank you.

-- 
Joaquim Laureano
Lusostar Technologies, LLC
291 Old Deal Road
Eatontown, NJ 07724
Phone: 732-542-4890
Email: laureano@xxxxxxxxxxxx




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