Conclusion On Relaying Denied - Relaying denied Error generated whenever any of the recipient to which email sent by sender has not respond or reject directly by the recipient’s server.

If you are sending emails on outlook express to the more one recipients at a time then if you are getting an error “The message could not be sent because one of the recipients was rejected by the server “Relaying denied”, Proper authentication required.” There nothing much which you can do about this. Here I trying describe you what does this error means and how you can solve this Relaying denied error.

Relaying Denied

Lets first talk about how the process of sending an email to the recipients has been done.

Process of Sending an email on outlook express

• Your email client first connect with the ISP server and send the request that Here is an email and the destination server address.
• Then the ISP server connect with the destination server with the help of proxy servers.
• Now those proxy server send an email to the final destination server.
• Now it depends on the destination server wheather to accept an email or not.
• If the destination or any proxy server reject an email request to send then the error of relaying denied generate on the sender side.
• When this error is generate on sender side the email client show the specific error.

That is how the error of relaying denied generate at the email sender side. How the point is that the reason which is responsible to generate the error relaying denied.

Here now i am showing the reasons which is responsible to the error of Relaying denied on outlook express.

Reasons for Relaying denied error on outlook express

• Email are sending regularly and the destination server thinks that the upcoming email are spam mails.
• Specific email has been discarded by one of the proxy server.
• Email has been discarded by destination server because of unknown error.
• Email has been discarded because of TTL ( Time To Live).

Those are some of the reasons which is responsible for generating an error of Relaying denied on outlook express.