freakazeud has a good idea; however, some email systems will kick it out as
spam if you have too many addressees in the BCC field or even TO or CC
fields. I get around this by sending individual emails to a group of about
150 people.
Then I upgraded to Office 2003 and there Outlook asks you if your really,
really want to send that email. 150 times! Fortuately there's a little
freebie product called ClickYes that will do this for you.
Then my ISP, Charter, decided that you might be spamming if you send out
more than 50 emails an hour unless you have a more expensive commercial
account. My database now sends out about 40 emails, waits an hour, sends out
40 more, until they are all sent. What used to take minutes no takes hours to
do.