Usually when you get an authentication error message it is because the SMTP server or your outgoing e-mail server is looking for a user name and password. If one isn't supplied, it will continue to bouce back.
The best thing to do is to contact your e-mail provider and find out if something is going wrong on their end and ask them if you do need SMTP authentication. If you do what is the user name and password.
Good luck on that.
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