I have over 50 distribution list.  Some people's information is in more than
one dl.  How can I send out massive email without sending multiple emails to
those in more than one distribution list?
In other words I only want everyone to get a email message but only once;
regardless if they are on other lists.  
I need this done without eliminating them from the list that they are on,
even if they are on more than one list.  I hope this makes sense.

Please advise!!