Help, our exchange server is being used by spammers and I don't know how to
prevent them using it. This afternoon legitimate e-mail was prevented
because they had managed to overload our server.
Our setup is as follows:
We have a primary e-mail server running Exchange 5.5. All e-mail to
domain1.com gets forwarded from the primary e-mail server to a secondary
e-mail server immediately on receipt. All e-mail to domain2.com and
domain3.com is routed inbound to the primary e-mail server.
How do I prevent e-mail to any other domain being routed through our server?
I managed to prevent e-mail being routed by changing a registry key but this
also prevented the mail to domain1.com being routed to the secondary e-mail
Thanks to those that can help,