See the info at this link about 550 errors:
http://www.insideoe.com/problems/errors.htm#550relay

It appears that Hughes.net requires authentication to use their SMTP server.
Look under Tools/Accounts - Mail for your account with Hughes and double
click it to open it. Then click the Servers tab and at the bottom of the
page for Outoing Mail there is a box to check for authentication. Make sure
your Hughes account information and password is provided in the Settings
box.
--
Jim Pickering, MVP, Outlook Express
https://mvp.support.microsoft.com/pr...8-1171988A62D6
Please deliver feedback to the newsgroup, so that others can be helped.


"Pat Miller" wrote in message
...
I get this message when I send mail. Need to know what this error code
means
and how to fix it. I don't get a message when I try to receive, I just
don't get the mail.

The message could not be sent because one of the recipients was rejected
by
the server. The rejected e-mail address was 'jjon . Subject
'Email problems', Account: 'mail.hughes.net', Server: 'smtp.hughes.net',
Protocol: SMTP, Server Response: '550 RCPT TO:jon Doe @abd.com Relaying
not
allowed - please use SMTP AUTH', Port: 25, Secure(SSL): No, Server Error:
550, Error Number: 0x800CCC79

Any help you can give me will be much appreciated
Pat Miller