Error 503: Valid RCPT command must precede DATA

The most common reason for this error is an incorrectly configured mail client.

In order to solve this issue you should reconfigure your email client to authenticate to the SMTP server.

 

In Outlook, for example, this can be done by checking the "My server requires authentication" box in the Outgoing Server section of your mail options.

Was this answer helpful?

 Print this Article

Also Read

Disallowed Filename Attachments

The following is a list of file attachments that may be blocked by the service (the attachments...

Checking Port 25

  On a Windows PC Click on the Start menu button, usually located at the lower...

What is Email?

    What is email?Email refers to electronic mail, which is a convenient means...

Combatting Spam Email

What is Spam?The term Spam is believed to originated from a 1970's Monty Python's Flying Circus...