warning : /usr/lib/postfix/trivial-rewrite : bad command startup -- throttling

Hi

I recently tried to configure a server with your how to Virtual Users And Domains With Postfix, Courier And MySQL (+ SMTP-AUTH, Quota, SpamAssassin, ClamAV (http://howtoforge.com/virtual_postfix_mysql_quota_courier), and when I finished I've tried to send a mail from an account in this server, but I couldn't do it because there's an error on the sending.

When I look the logs on the server, there's only a warning that I think will be tha cause of my problem, this warning is:

"warning : /usr/lib/postfix/trivial-rewrite : bad command startup -- throttling"

I need to know what to do to dissapear this warning and to make the server works fine, if I copy and paste all the steps you describe on this how to.

Please help me, I'm very hurried!

Thank you and regards.