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Exchange 2007 SP1 - Header / SMTP Question

We've recently installed Exchange 2007 SP1 with the Hub Transport role on a Dell PE2950.  All has been working great, however, there is a slight problem with sending email to certain domains.  I've checked various PBL's and we are not located on any.  The SMTP connector was setup by following Microsoft's TechNet article.

When looking at the header information sent from our exchange server, and comparing it to other emails...the following is shown:

Received: from mail.suwgov.org ([])  (our server in question)
          by ispmxfep08-srv.windstream.net with ESMTP (our ISP)
          id <20090421144900.VDVG27628.ispmxfep08-srv.windstream.net@mail.suwgov.org>
          for <james_monroe@hotmail.com>; Tue, 21 Apr 2009 09:49:00 -0500

Shouldn't "by" be the name of our email server instead of ispmxfep08-srv.windstream.net?  When looking at other email headers from other exchange email servers, "by" is usually the organization's internal email server.  Am I missing something?  I've had the ISP add a PTR record for our mail server, but they added it for smtp.suwgov.org because I already added a PTR record on NetworkSolutions for mail.suwgov.org.

What gives?  The email return errors we're getting on certain domains is "Direct to Mx" which leads me to believe this is related to our header information.

Thanks for your help.
1 Solution
For outbound email the by would be the next server in the hop, which would be your ISPs server if you are using them as a smart host on a Send Connector.

Usually with Exchange 2007 there is an internal hop, which is between the server itself as it is handed to the Hub Transport system for delivery. Then the next hop is to either the smart host, Edge server or if delivery is direct, to the server receiving the email.

Your reverse DNS seems fine, so I do not see anything wrong with the above. However if you want to deliver email directly then do check you haven't set a smart host on your Send Connector.

itsccocAuthor Commented:

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