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Have you disabled sender authentication on the group?<br />
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<a href="http://exchangeshare.wordpress.com/2008/05/18/distribution-list-not-getting-mails-from-outside-ndr-511/" rel="ugc">http://exchangeshare.wordpress.com/2008/05/18/distribution-list-not-getting-mails-from-outside-ndr-511/</a>
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Have you disabled sender authentication on the group?

http://exchangeshare.wordpress.com/2008/05/18/distribution-list-not-getting-mails-from-outside-ndr-511/ [http://exchangeshare.wordpress.com/2008/05/18/distribution-list-not-getting-mails-from-outside-ndr-511/]

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I have created a distribution group in windows 2007 that has a couple of exchange 2003 users in it (I am running an environment with 2003/2007). I created the distribution list on the 2007 server and when I send it e-mail internally the e-mail it works. When I send it externally I am receiving an NDR that says 5.7.1 failed. When I look at the E-mail address information the X400 information is not being populated either.
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I have created a distribution group in windows 2007 that has a couple of exchange 2003 users in it (I am running an environment with 2003/2007). I created the distribution list on the 2007 server and when I send it e-mail internally the e-mail it works. When I send it externally I am receiving an NDR that says 5.7.1 failed. When I look at the E-mail address information the X400 information is not being populated either.

Distribution group not working externally, but works internally in Exchange 2007

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.