| Babylon5 2004-05-21, 5:47 pm |
| 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 and 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 Console to forward everything on Port 25 to our Brightmail server via Nic2(internal), 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 forwarded 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 25 to Brightmail.
Our SMTP Site Remote Domain is called OurCompanyName.com (with the Brightmail 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 forwarded? Or any and all info you may have is appreciated.
Thanks
Eric
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