Failed to send email from outside our domain to a created distribution list email

I just tested the email address from inside our domain and it worked fine. .  I tested the email using my gmail account and the test email did not work.  I received this message:

Delivery has failed to these recipients or groups:
dist_orders@gatekeepersystems.com

Your message can't be delivered because delivery to this address is restricted.

What am I missing,

Thanks
gatekeeperitAsked:
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Suliman Abu KharroubIT Consultant Commented:
please test smtp on mxtoolbox.com
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gatekeeperitAuthor Commented:
This is what I got,  Other email is working from our domain, it is only that one email distribution group I created in exchange. (recipient configuration-->distribution groups)  This is where I created it, then added the members and then tested the email address internally.  That worked.  Tested externally and it did not.


smtp:216.82.254.163     smtp    
220 server-7.tower-198.messagelabs.com ESMTP
 OK - 216.82.254.163 resolves to mail198.messagelabs.com
 OK - Reverse DNS matches SMTP Banner
 0 seconds - Good on Connection time
 Not an open relay.
 0.359 seconds - Good on Transaction time



Session Transcript:
HELO please-read-policy.mxtoolbox.com
250 server-7.tower-198.messagelabs.com [47 ms]
MAIL FROM: <supertool@mxtoolbox.com>
250 OK [31 ms]
RCPT TO: <test@example.com>
553-you are trying to use me [server-7.tower-198.messagelabs.com] as a relay, but I have not been configured to letyou [64.20.227.133, recover.mxtoolbox.com] do this.Please visit www.messagelabs.com/support for moredetails about this error message and instructions toresolve this issue. (#5.7.1) [47 ms]
QUIT
553-you are trying to use me [server-7.tower-198.messagelabs.com] as a relay, but I have not been configured to letyou [64.20.227.133, recover.mxtoolbox.com] do this.Please visit www.messagelabs.com/support for moredetails about this error message and instructions toresolve this issue. (#5.7.1) [47 ms]
 
reverse lookup smtp diag port scan blacklist

Reported by mxtoolbox.com on Friday, April 08, 2011 at 12:56:40 PM (GMT-5)  (History)




mx:gatekeepersystems.com     mx    

Pref Hostname IP Address TTL  
10 cluster2.us.messagelabs.com 216.82.254.163 30 min SMTP Test Blacklist Check
20 cluster2a.us.messagelabs.com 216.82.248.45 30 min SMTP Test Blacklist Check
dns lookup ns lookup mx lookup whois lookup

Reported by a.ns.interland.net on Friday, April 08, 2011 at 12:55:59 PM (GMT-5)  (History)


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Suliman Abu KharroubIT Consultant Commented:
OK then, please go to DG properties --> delivery options --> and un check the check box which says " senders should be authenticated".
it is checked by default.
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gatekeeperitAuthor Commented:
#1. Click the Distribution Group name as you want to set

#2. Click the "Properties"

#3. Click the "Mail Flow Settings" Tab

#4. Click the "Message Delivery Restrictions" item

#5. Click the "Properties..." button

#6. Uncheck the "Require that all senders are authenticated" item

#7. Click "OK" button

#8. Click "OK" button again
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gatekeeperitAuthor Commented:
Thank You for your help
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Suliman Abu KharroubIT Consultant Commented:
you are welcome :) and thanks for points ;)
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