Send email to distribution group from outside the domain

I have a distribution group called staff with the smtp address staff@domain.com. When trying to send an email from my gmail to staff@domain.com it is bouncing back. What should I look at to get this to work. Any help is appreciated.
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lgg733Asked:
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jerrypdCommented:
i would recreate the group - i just tested on a 2003 box and it became enabled right away...
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Steven CarnahanNetwork ManagerCommented:
Can you provide the actual wording on the NDR message?  Go ahead and mask the actual address if you need to.
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jerrypdCommented:
Did you disable the Sender Authentication?
if not, then that could be your issue.
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lgg733Author Commented:
Delivery to the following recipient failed permanently:

    staff@domain.org

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 554 554 Unknown Recipient (#5.1.1) (state 14).

----- Original message -----

MIME-Version: 1.0
Received: by 10.52.108.66 with SMTP id hi2mr1215527vdb.243.1314978031213; Fri,
 02 Sep 2011 08:40:31 -0700 (PDT)
Received: by 10.52.163.201 with HTTP; Fri, 2 Sep 2011 08:40:31 -0700 (PDT)
Date: Fri, 2 Sep 2011 11:40:31 -0400
Message-ID: <CAFT82TmSKLvwX5jsHE4xccTATSFoSuiKONi=x_on9DJ=vje+BA@mail.gmail.com>
Subject: this is a test
From: Some Dude <somedude@gmail.com>
To: staff@domain.org
Content-Type: multipart/alternative; boundary=bcaec548644e701ba504abf72efb
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lgg733Author Commented:
@jerrypd where do I check if sender authentication is disabled?
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jerrypdCommented:
what version of outlook are you on?
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jerrypdCommented:
exchange - not outlook - sorry
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jerrypdCommented:
if exchange 2007, go to powershell and run this:
Set-DistributionGroup “staff¿ -RequireSenderAuthenticationEnabled $False
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lgg733Author Commented:
It is sbs 2003. When I look at the properties of the group it says accept messages from everyone.
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Steven CarnahanNetwork ManagerCommented:
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lgg733Author Commented:
Should I follow what this article says even though I am not using 2007?
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jerrypdCommented:
if you go into the properties of the group in Active Directory - is the email address you want listed?
Was this group created on the exchange server?
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lgg733Author Commented:
Yes if I go into properties of the group in AD the email address is there. I did not create this group it was when I started working here. I would assume it was created on the exchange server. It is a mixed group of email address' at our domain and other external domains.
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Radhakrishnan RSenior Technical LeadCommented:
How's the group created? security-Local or Security-Global? Outside communication this should be global.
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Steven CarnahanNetwork ManagerCommented:
Is it also possible that since the group contains external addresses that it is being treated as a relay?
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lgg733Author Commented:
Yes it is global. I think I found the issue. I totally forgot we are using an offisite sendio anti-spam box. I don't administer it so I had to send an email to the company who does. Maybe they accidently deleted this address out of there or something. I will update when I hear back from them. Thanks for the help.
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Suliman Abu KharroubIT Consultant Commented:
open the group properties from EMC -- and go to delivery options --> un-check "require all users to be authenticated"
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lgg733Author Commented:
It ended being that the address was not added to the sendio . I think it must have gotten deleted somehow but in any case re added and it works. Thanks for the help.
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