routing email

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Using a single outside address I need to route all incoming smtp to one box
and route all outgoing smtp from another box out through the same address.

I have two boxes for email (incoming/outgoing), but I need to use the same
outside address for both. Currently I have all traffic routed to one with ip
nat inside source static tcp 25 25 extendable
and the other sends out mail through a nat pool address. This prooves to be
problematic, other companies doing and reverse lookup sometimes bounce our

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