distribution groups

I configure a distribution group according to the rules.
I send a test mail from my outlook client and my mail reach both addresses I puted in the group
but when sending from an 'asterisk' in the same network, exchange 2010 'swallow' the mail but does not deliver
any clue?
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I'm guessing the distribution group is not allowing mail to be sent to it from non-authenticated senders.  Have you checked the properties of the distribution group to look for a check-box that enables/disables accepting mail from non-authenticated sources (I know Exchange 2003 has this check box on dist groups).  Or else you could try setting up authentication for when Asterisk sends an email.

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mbuisseretAuthor Commented:
thank you
in exch2010, it is in:
distribution group properties\mail flow settings\message delivery restrictions
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