Error 503: Mail server requires authentication

Asked By 200 points N/A Posted on -

Please find some time to consider this problem. An hour ago, I was about to send an email using my 3Essentialss hosting account but this error message stopped the process “Error 503: This mail server requires authentication. Please check your mail client settings.” I consulted our IT support group about this issue, but they were not able to find any remedy.

According to them, some of our email clients attempt to send emails to our server without providing some authentication requirements such as password and user names. Is there perception on this issue correct? And so I posted this concern here hoping that you can enlighten me about this problem that I have. Thank you for your help.

Answered By 0 points N/A #111703

Error 503: Mail server requires authentication



Your IT support Group is correct. This problem occurs when the "My Server Requires Authentication" check box is not selected. Your email client is sending the email to the server without providing a password and this cause the server to require proper authentication. The best thing you can do is to check the "My Server Requires Authentication" box.

If you are using Outlook Express, here's how you do it. The screenshot will guide you:

Go to Outlook Express –> Tools –> Accounts –> Mail –> Properties –> Servers

For Outlook 2003, do these steps. Again, you can follow the screenshot:

Go to Outlook 2003 –> Tools –> E-Mail Accounts –> View or change existing e-mail accounts –> Select email account –> Click Change –> "More Settings" –> Click Outgoing Server – Check the "My outgoing server (SMTP) requires authentication"


There it goes, you should be able to send emails now.


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