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Relaying is the transfer of messages via SMTP from one
server to another. You'll want to prevent unauthorized
senders -- in other words, spammers -- from using your
Exchange Server as an SMTP relay to hide the real origin
of their messages. Exchange Server 5.0 is vulnerable to
unauthorized relaying if you allow local SMTP users -- as
you probably would if you have users connecting with a POP
client. Exchange Server 5.5 adds restrictions to allow the
administrator to specify who can and cannot relay mail
through the server.
Basics
| Exchange
5.5 relay vulnerability patches | Tools |
More Information
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Exchange Server 2003
Intelligent Message Filter (IMF)
