SOLVED Not permitted to relay through this server error

[luckymlombo]

Pease help my problem is as follows

 (
The response from the remote server was:

550 Please turn on SMTP Authentication in your mail client. (http://mail-ot1-f50.google.com) [192.168.xxx.x]:44484 is not permitted to relay through this server without authentication.)

 

[alpinist]

I was able to fix it one of my servers by disabling and re-enabling SMTP Restrictions at WHM >> Home >> Security Center >> SMTP Restrictions.

Here are other discussions of the error:

Please turn on SMTP Authentication in your mail client errors

All of a sudden customers on different servers get the following error: SMTP error from remote mail server after RCPT TO:: 550-Please turn on SMTP Authentication in your mail client, or login to the 550-IMAP/POP3 server before sending your message. All have SMTP Authentication turned...

forums.cpanel.net

Tutorial - Troubleshooting "550 Please turn on SMTP Authentication in your mail client"

Overview In this tutorial, we'll explore some of the common reasons that users may encounter the following error message: 550 Please turn on SMTP Authentication in your mail client This is often a frustrating error message to troubleshoot...

forums.cpanel.net

 

[cPanelLauren]

@alpinist - Thanks for sharing those!

@luckymlombo - Please let us know if you have further questions or concerns once you read those.

 

[baras]

I was able to fix it one of my servers by disabling and re-enabling SMTP Restrictions at WHM >> Home >> Security Center >> SMTP Restrictions.

Worked for me too.
Thanks very much!