Mailbox unavailable. The server response was: 5.4.1 Relay Access Denied

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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.

Posted 6-Oct-11 22:51pm

Sharad Mishra

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phil.o · Answer 1 · 2011-10-06T23:02:00

Solution 1

Your SMTP server should be configured to be authoritative for one domain (i.e. mydomain.com). Better choose a mail domain name that is more representative (mydomain.com seems way too much generic).

Posted 6-Oct-11 23:02pm

phil.o