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Each day I get about 50 events like this one. Unable to relay for ....@..... 550.5.7.1

This is an SMTP protocol log for virtual server ID 1, connection #759. The client at "" sent a "rcpt" command, and the SMTP server responded with "550 5.7.1 Unable to relay for ben@applecentrecentralcoast.com.au ". The full command sent was "rcpt To:<ben@applecentrecentralcoast.com.au>". This will probably cause the connection to fail. For more information, click http://www.microsoft.com/contentredirect.asp.

This is what appears in the event log.  There are about 40-50 per day, the ip address means nothing to me and the domain name means nothing either, it's not related to us.

Any thoughts

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8/22/2022 - Mon