It looks like your server got blacklisted.  Find who's
list you are on and try to get removed.  Also, check your
server to see if it has open relay set which will get you
blacklisted.

Sincerely,
Invotion Engineering Team
Advanced Microsoft Hosting Solutions
http://www.Invotion.com

>-----Original Message-----
>Why only one remote server don't accept IIS requests ?
>The message is as following:
>Error in SMTP protocol. The error verb is 'RCPT'. The
answer of remote server is '571 Service unavailable;
Client host blocked using rbl.mail.sys.intranet; Listed '.
>
>.
>

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