Outlook / SMTP error code 550
smtp;550 5.4.1 All recipient addresses rejected : Access denied [#.eop-nam02.prod.protection.outlook.com]
Medium severity
This could be due to an active block on the sender for abuse reasons, but typically it's a policy that only specific senders/servers are allowed to send mail to this host. Reach out the recipient directly for options to add the sender to their 'allow list'.
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