You may define Accept Message From and Restrict Message From settings for the distribution list.
To set restriction to a distribution list navigate to the following path:
Click on the Service Management link and then select Distribution List tab. Click on the distribution list name for which you wish to add email address and select Advanced tab.
The advanced interface displays following:
Accept Message From: There are two options to select from:
All senders: If selected, message will be accepted from any sender.
Only senders in the following list: If you selected, the message will be accepted only from the addresses selected from the list.
Reject Message From: There are two options to select from:
No senders: If selected, message will never be rejected.
senders in the following list: If you selected, the message will be rejected if coming from the addresses selected from the list.
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