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Distribution Groups are NOT receiving external emails

I'm new with exchange

I have exchange 2007 is working fine and have 100 users with some distribution groups
I just handling the job to manage the exchange
my first problem with this exchange is when i add any new distribution group this group is not able to receive emails from external mail like gmail,yahoo etc and always got rejected with the below error


Delivery has failed to these recipients or distribution lists:

Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.
Sent by Microsoft Exchange Server 2007

Diagnostic information for administrators:

Generating server: mydomain.com

#550 5.7.1 RESOLVER.RST.AuthRequired; authentication required ##

but I'm able to receiving emails to the same group from users which are in the same exchange  also the others groups which are already created  are able receiving emails from in/outside without any problem.
I don't know my way for adding groups are right or wrong way ,In order to add new group

1. from AD right click on distribution group and > new group and select |Distribution | Global|
2. now from exchange right click on Distribution Group and click on New Distribution Group then click next and select existing group then i select the group which I had created on AD
but one thing I would like to mention it which is from the list of selecting existing group i found the others group type is "Universal SecurityEnabled" but my group which i recently added  is only universal with out securityenabled
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1 Solution

You need to allow non-authenticated email to be routed via the distribution group.

In the properties of the group in Exchange Management Console, go to 'Mail Flow Settings', 'Message Delivery Restrictions', Properties and uncheck the 'require that all senders are authenticated' checkbox.

This will allow the group to receive mail from external sources.

jmishalAuthor Commented:
thanks , it's working fine
jmishalAuthor Commented:
yes , now is working

thanks dear
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