Hello,

I'm running a small PC network, including an Exchange server, behind an
EigerStein using NAT.  Most of the time everything works great.

However, e-mail sent by the Exchange server to a few domains fails, I
understand, because there is no public reverse DNS for the Exchange server,
and some mail servers therefore suspect e-mail coming from it is spam.  Only
the EigerStein router has a public IP.  

In other words, e-mail from the Exchange server includes headers like
this...

Received: from server.aac.edu (gw.aac.edu [195.113.149.145])
          by ...

... where server.aac.edu is the Exchange server, which has no external DNS
entry, and gw.aac.edu is the NATing EigerStein router with public IP
195.113.149.145.

What do I need to do to make this failing e-mail go through?  Add DNS
entries for server.aac.edu?  Can I rename the Exchange Server "gw" (since
there's no gw.aac.edu on the internal network)?

Thanks for your attention!

Barbara Miller

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