I am getting "Mailbox unavailable. The server response was: 5.4.1 Unable to relay for myemail@mydomain.com" when I try to send the mail using C# code. Then I tested my smtp server https://www.wormly.com/test_smtp_server". Here when I enter my smtp server, sender and recipient name. I got followoing message: MAIL FROM: mymail@mydomain.com SMTP -> FROM SERVER: 250 2.1.0 Sender OK RCPT TO: anothermail@mydomain.com SMTP -> FROM SERVER: 550 5.4.1 Relay Access Denied SMTP -> ERROR: RCPT not accepted from server: 550 5.4.1 Relay Access Denied Message sending failed.
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