Is there a way to disallow relaying emails from external domains, to external domains, in Exchange 2003?
Example:
internal.com
is the only domain that this server manages.
- I want to allow emails from
internal.com
tointernal.com
. - I want to allow emails from
internal.com
to other domains (incl. from remote locations) - I want to allow emails from other domains to
internal.com
- I don't want to allow emails from other domains to other domains
The server isn't an open relay, but by authenticating, it's still possible to send email from external domains to other external domains. Is there a way to prevent this?