I was researching on this issue a little bit more. I think I know what the
problem is. Since Exchange 2000 has 2 smtp virtual servers with the same IP
address there was a problem of to which mail should route. If a mail
message was sent to the ip address then the 2 SMTP virtual server would
respond but wouldn't know on what to respond too.
Here's what you need to do.
1) Remove the second virtual server that you created.
2) Stop and Restart IISAdmin
3) Go the properties of the default smtp virtual server
4) Click on the General tab, then select "All Unassigned" for the IP address
5) Click on the Access tab, then click Authentication, check all boxes
except for Requires TLS authentication. When checking all authentication
for the virtual server, you're actually not exposing the server to the
internet, rather giving it options for other mail servers to connect to.
6) Click on the Connections button (Access tab), Select "All except the
list below" and the list should be blank. So far you've configured the
server to use 3 authentication methods and to accept connections from
7) Click on Relay (Access tab), Select "Only the list below". The list
should be blank. Select "allow all computers which successfully
authentication to relay"
NOTE: This is different from the AUTHENTICATION button. The relay button
is actually the one that restricts the clients or other people to relay
from your server.
NOTE: The Relay settings is totally different from the Authentication and
Connection buttons. To be more specific mail servers out there, some of
them needs to anonymously connect to your server to send mail, this is
where the Authentication and Connection button comes into place because
most mail servers out there needs to issue telnet commands to your server
for them to send mail to your domain
8) After making the changes stop and restart the IISAdmin service again.
To make sure that clients shouldn't be able to relay to this server, see
the following kb.
HOW TO: Prevent Exchange 2000 from Being Used as a Mail Relay in Windows
HOW TO: Block Open SMTP Relaying and Clean Up Exchange Server SMTP Queues
on SBS 2000
NOTE: On the article above DON'T follow all the directions. Just follow the
section "Determine Whether the Exchange Server Is an Open SMTP Relay"
I look forward to hearing from you.
Thank you and have a nice day.
Don Tan, MCSE/MCSA
Microsoft Online Support Professional
Get Secure! - www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.