Make sure you have send authentication enabled.
Go to Tools, Accounts, select that account, Properties, Servers.
The box for "My server requires authentication must be checked.
--
Gary VanderMolen, MS-MVP (Mail)
"Nancy" <Nancy@xxxxxx> wrote in message news:1BC24013-7DBD-43B9-8DC2-CE6E2121DA32@xxxxxx
Quote:
> The message could not be sent. The authentication setting might not be
> correct for your outgoing e-mail [SMTP] server. For help solving this
> problem, go to Help, search for "Troubleshoot Windows Mail", and read the
> "I'm having problems sending e-mail" section. If you need help determining
> the proper server settings, please contact your e-mail service provider.
>
> The rejected e-mail address was 'nd5777@xxxxxx'. Subject 'Fw: Ralph &
> Edna', Account: 'pop.aim.com', Server: 'smtp.aim.com', Protocol: SMTP, Server
> Response: '556 CLIENT AUTHENTICATION REQUIRED. USE ESMTP EHLO AND AUTH.',
> Port: 25, Secure(SSL): No, Server Error: 556, Error Number: 0x800CCC78