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Preventing your Domino server from being an Open Relay can be configured in the Server's Configuration document.
Go to the Router/SMTP Tab > Restrictions and Controls Tab > SMTP Inbound Controls Tab > and in the Inbound Relay Controls Section set the following fields to an Asterisk(*).
"Deny messages to be sent to the following external internet domains:" (* means all)
"Deny messages from the following internet hosts to be sent to external internet domains:"(* means all)
Feedback response number WEBB8RGMCX created by ~Mary Dwonither on 02/14/2012