Sunday 31 March 2013

503 This mail server requires authentication when attempting to send to a non-local e-mail address

If you are facing the following error in receiving the emails for Plesk Webmail on Windows server:

We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 503 503 This mail server requires authentication when attempting to send to a non-local e-mail address

Resolution:
1. Open the Mailenable and go to the SMTP properties.

2. Under "Advance SMTP" tab, go to the Inbound authentication and select the option of "Do not require authentication" from the drop down list.

3. Click Apply and Ok.

4. Restart the SMTP service.

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