erro ao enviar email

and_web
(usa Slackware)

Enviado em 21/04/2008 - 02:08h

cansei de ficar horas e horas no google, lendo vários tutoriais estudando sobre dns e nada. postei o erro a baixo se alguem souber a solução fico grato obrigado.
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This is the mail system at host host.dominio.com.br.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<meuemail@gmail.com>: host gmail-smtp-in.l.google.com[72.14.247.21]
said: 550-5.7.1 [189.70.1.71] The IP you're using to send mail is not
authorized 550-5.7.1 to send email directly to our servers. Please use the
SMTP 550-5.7.1 relay at your service provider instead. Learn more at
550 5.7.1 http://mail.google.com/support/bin/answer.py?answer=10336
9si3632051agc.33 (in reply to end of DATA command)