hen you create a new distribution group within Exchange and try to send an email from an external address to this group, you will receive a error message which states that you must be authenticated to send to this group.
This is the default behavior of Exchange 2007 to avoid SPAM.
To change this behavior open the
Exchange Management Console an navigate to the
affected distribution group. Open the
Settings for this group and switch to the tab “
Mail Flow Settings“. On this tab mark “
Message delivery restrictions” and select “Properties“.
In the new Window ensure that the checkbox “
Require that all senders are authenticated” is not selected.
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