We have a multi-homed NT4 box (Called Server1) that is running:
Exchange 5.5
DNS
Proxy Server 2.0 (our gateway to our ISP)
Nic1 - external to the internet
Nic2 - internal to the network and the Brightmail server
To the best of my knowledge, all service packs and patches for NT4, Proxy an
d Exchange that exist have been applied.


Senario:
Email comes into the Proxy Server on Nic1(external) from the internet.
We've setup our Default SMTP Site's Remote Domain, in the IIS Management Con
sole to forward everything on Port 25 to our Brightmail server via Nic2(inte
rnal), which then after it checks for spam, forwards it back to the same NT4
 box to Exchange via Nic2(i
nternal).
99% of the mail does get forwarded to the Brightmail server and then back to
 Exchange properly.
1% (which happens to be all Asian Spam coming in on Port 25) never gets forw
arded to the Brightmail server and somehow gets passed directly to Exchange 
even though our Default SMTP Site's Remote Domain says to forward all Port 2
5 to Brightmail.
Our SMTP Site Remote Domain is called OurCompanyName.com (with the Brightmai
l server's IP in brackets)
Our SMTP Site Local  Domain is called Server1.OurCompanyName.com


Our Internal DNS is setup this way:

OurCompanyName.com	NS  Server1.OurCompanyName.com
OurCompanyName.com	SOA Server1.OurCompanyName.com
OurCompanyName.com	MX  SMTP1.OurCompanyName.com
Server1		A   Nic2
SMTP1			A   Nic2
NS			CNAME Server1.OurCompanyName.com


Our question is, how does the 1% of mail go directly to the Exchange Server 
and not get forwarded to Brightmail? and how can we fix it so it does get fo
rwarded? Or any and all info you may have is appreciated.
Thanks
Eric

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