Exchange 2003 Relay Domain

I have been contracted with setting up a relay configuration, and I feel pretty comfortable with it, but I wanted to verify what I know, and ask a few questions.  Here is the situation.  Subsequent to a merger, we need to set it up so that Company A's server will relay mail to Company B's server, which will reside on the same physical, but different logical network.  So, on Company A's server I need to create a Receipient Policy, non-authoritative, for company B's domain, so that the company A's server accepts email for that domain.  I then need to create a SMTP connector for that domain, so it know's what to do with that mail.  My first question is, when I select the bridgehead for that connector, do I create a new Virtual SMTP server, entering a Smart Host, so it knows where to forward that mail? If so, what is the correct method for creating that Virtual Server?  Once that is created mail destined forr Company B should hit Company A's server, and be routed to Company B's server, for delivery, correct?  
      Ok, that takes care of the inbound side.  On the outboud, Company B wants their email to come out as user@companyA.com.  Which means I need to set up an outbound SMTP relay.  On company A's server, I need to modify the Default SMTP Server to allow relaying from Company B's server.  Then on Company B's server I need to create another SMTP connector, and set it to forward alll mail through the Company A server, using the local SMTP Virtual Server as the Bridgehead.  I then need to update the Receipient Policy on Company B so that all users have a primary address of user@companyA.com.  What do I need to do with the X400 address in the RP?  I think that about covers all my questions.  Thanks!
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mgeogheganAsked:
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cmccallCommented:
The answer to you first question is no, you do not need to create a new SMTP virtual server.  In the SMTP connector, set the smarthost there.  As for the second question, you should not need to modify the X400 addresses.  It should not matter at all.
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mgeogheganAuthor Commented:
Ok, well I set it up to test.  I have a test Exchange Server, and I set it up to relay to my gmail account.  The problem at this point is that messages get relayed, but when they make it to gmail, the from address is overwritten to the gmail address.  So when I do MAIL FROM:myaddress.domain.com and RCPT TO:GMAILADDRESS@GMAIL.com, the message makes it to my gmail account, but says it's from the RCPT TO address, not the MAIL FROM address.
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cmccallCommented:
Do you have GMAILADDRESS@GMAIL.com as a proxy address on the AD account?  
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mgeogheganAuthor Commented:
I figured it out, in order to get the Gmail working for SMTP I had to set TLS Auth, and put a username and PW in there.  I put the Gmail address for the Auth, so messages were coming from it.  In the live env that won't be a problem.  
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mgeogheganAuthor Commented:
Great job, fast response.  Thanks!!
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