You have to take a look at the queue coz the mails have to find the destination mail server before they leave your server.
try to use some DNS utilities nslookup, just to see if you can see the destination mx record or what ?
Mohamed....
>From: jibarra@xxxxxxxxxxx
>Reply-To: "[ExchangeList]"
>To: "[ExchangeList]"
>Subject: [exchangelist] Help
>Date: Wed, 17 Apr 2002 11:03:35 -0700
>
>http://www.MSExchange.org/
>
>
>Hi all,
>
>I have a situation where my users can't send email to this particular
>
>domain.
>
>I ma running X5.5 on windows 2000 server.
>
>Whenever we send an email to xx@xxxxxxx the email goes
>
>out, leaves our server, but it never reaches the recipient nor we get an
>
>NDR.
>
>Please help.
>
>Juan
>
>
>
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