Error 553 sending email: Sender address rejected not logged in

Procédure

Why is there this problem? 

This problem occurs when the SMTP server requires the user to be authenticated in order to send the email.

How to solve this problem?

If you have a problem sending email from your email client ( Outlook, Thunderbird, Windows Live Mail etc ), it is imperative to check the following points:

The incoming mail server ( = POP ) must be: mail.yourdomain.ext ( to be replaced with your domain name: for example " mail.mydomain.net ", or " mail.mycompany.fr " )

The incoming mail server port must be: 995 with SSL security

The outgoing mail server ( = SMTP ) must be: mail.yourdomain.ext ( to be replaced with your domain name: for example " mail.mydomain.net ", or " mail.mycompany.fr " )

The outgoing mail server port must be: 465 with SSL security

Your outgoing mail server must identify itself using your full email address and its password.

Your full email address ( POP and SMTP account username ), must be entered in LOWERCASE

Change your email password if you still cannot connect to your mailbox.

You must check in the advanced settings "my outgoing server requires authentication"

Conclusion 

You are now able to solve the problem of sending email on your Web hosting with LWS. This is very often a configuration problem with your software.

Feel free to share your comments and questions!