Why do I receive the 550 error ( relaying denied ) message

Why do I receive the 550 error ( relaying denied ) message when sending the email ?


We use SMTP Authentication which means you must provide a username and password to send mail (SMTP) just as you do to receive mail (POP3). In most email client software there is a checkbox or field that allows you to specify whether the mail server, i.e. mail.yourdomain.com does or does not use SMTP authentication. In Outlook or Outlook Express, the checkbox says "My server requires authenticaton". Check it to activate this feature.