Ok, I know this has probably been answered 1000 time here, but humor me as I make sure I understand Exchange 2000 SMTP Relay.
I have and exchange server sitting on my active directory domain, domain1.com and domain2.com. My domain is behind a firewall via NAT.
Domain1.com is also my active directory domain name (I know, don't use a real public domain for my active directory, I heard that too late after configuring my network 5 years ago). Domain2.com is only for mail receive/send.
I have a single Virtual SMTP in exchange receiving for both domains. My send and reverse DNS are working fine as my Firewall is providing the correct broadcast IP for outbound Mail (matches my inbound IP).
I need all my internal users sending from domain1.com and domain2.com to be able to send mail.
I have a couple users that travel need to be able to send mail from the Web Interface and/or Entourage (uses HTTP connection).
How do I eliminate an open relay on exchange?