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 From:  "Christopher M. Iarocci" <iarocci at eastendsc dot com>
 To:  Aaron Freeman <aaron at pccreations dot net>
 Cc:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] Reverse DNS/Exchange 2003
 Date:  Sat, 07 Jul 2007 17:22:33 -0400
Aaron Freeman wrote:
> I have an email server running behind monowall. I am starting to get blocked emails due to the
fact that the recipients mail server thinks the email is coming from x.x.x.34 (monowall address) the
mail server resides at x.x.x.37 . Is there a configuration change I can make on the monowall?
Sounds like you might need to enable 1:1 NAT, but like Steve said, a 
diagram or more info about your network would be helpful.