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Users getting error when replying to messages from outside Notes domain

We are having a problem with getting replies to our e-mail messages from people outside our Notes domain. When they reply to a message one of our users has sent, they get the following error message:

"DELIVERY FAILURE: Not authorized to send mail to this user or group."

Do you have any idea what may be causing this? Any help would be greatly appreciated.
Check the settings in your configuration settings document in the Domino Directory. Particularly the values in the Router/SMTP Restrictions and Controls section --> Inbound controls. Sounds like you have restricted inbound messages.

Dig Deeper on Domino Resources - Part 7

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