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Unable to send email. Error: “No Server”.
Unable to send email. Errors: (550) No relay, or (530) no authentication.
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Unable to send email. Errors: (550) No relay, or (530) no authentication.
Most often cause of these errors is an incorrect router setup. The router is blocking SMTP authentication commands.
Contact your system administrator to resolve the issue.
If you have Cisco router remove command “ip inspect smtp”.