C# : Mailbox unavailable. The server response was: 5.7.1 Unable to relay Error

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Mailbox unavailable. The server response was: 5.7.1 Mailbox unavailable. The server response was: 5.7.1
status code 550- Mailbox unavailable.. server response was: 5.7.1 UNABLE TO RELAY on Edge Server... status code 550- Mailbox unavailable.. server response was: 5.7.1 UNABLE TO RELAY on Edge Server...
C# : Troubleshooting "Mailbox unavailable. The server response was: Access denied - Invalid HELO nam C# : Troubleshooting "Mailbox unavailable. The server response was: Access denied - Invalid HELO nam
Mailbox unavailable. The server response was: 5.7.1 Client does not have permissions to send as... Mailbox unavailable. The server response was: 5.7.1 Client does not have permissions to send as...
Email 554 5.7.1 : Relay Access Denied Error - How to Fix 2024 Email 554 5.7.1 : Relay Access Denied Error - How to Fix 2024
Sendmail: 550 5.7.1 Unable to relay Sendmail: 550 5.7.1 Unable to relay
Error "5.7.1 Relaying not allowed without prior authentication" when trying to send email Error "5.7.1 Relaying not allowed without prior authentication" when trying to send email
C# : smtpclient " failure sending mail" C# : smtpclient " failure sending mail"