Though I hate to admit it, we were also the victim of spam relay.  I wish I
could place full blame on the Business Partner that set up our Domino
Server, but I should educated myself better in what was going on.

We placed IP addresses in our:

Allow messages only from the following external internet hosts to be sent
to external internet domains:

section on the SMTP inbound controls.  We listed our internal IP addresses
and those of our wide area network.  The biggest pain for us was a sister
company that does not have a true e-mail server was relaying mail through
us.  Once we made this change, their e-mail broke (they do not have a
static IP address so we could not place them in this list).

Hope this helps,

Dwight Slessman

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