Distribution List Seen as Invalid Recipient

[DKR]

I followed Microsoft Outlook 2007 Help (F1) and was successful at creating a
Distribution List. However, when I attempt to send a message to the
Distribution List, I get the following from the "System Administrator":

Your message did not reach some or all of the intended recipients.

Subject: Test
Sent: 12/17/2009 1:15 PM

The following recipient(s) cannot be reached:

'Family' on 12/17/2009 1:15 PM
Invalid recipient

Any ideas how to fix this?

 

[Russ Valentine]

Message means that one or more of the recipients in the DL has an ivalid
address. We can't fix that from here. Only you can.