How to create New Distribution Groups taht receive Internet E-mail

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new distribution groups in exchange 2007 do not receive Internet e-mail by
default.
To enable receiving Internet e-mail after a group creation you can run the following CMDLET:

Set-DistributionGroup "Group_Name" -RequireSenderAuthenticationEnabled $true

another way for doing it:

1. open exchnage manager 2007.
2. browseto the target group properties,
3. browse Mail Flow Settings tab.
4. click Message Delivery Restrictions.
5. uncheck "Require that all senders are authenticated"
6. Press OK.