In the Send Mail dialog (it's the same dialog whether it's part of a script or you are sending the mail manually), There's an option called "Multiple Emails, one for each record in found set."
I had a Dynamics professor in graduate school who was standing at the blackboard writing a stream of partial differential equations and at one point he is discussing, and looking at, what he wrote and he says "it is intuitively obivously that..." and then he stops talking. He leaves the room and ten minutes later he comes back and says "I was right, it is obvious".
Some things are more obvious than others. Thanks for your help.
If you got more than one email adresses in one database, it can be send to more recipients. (I did´nt test it, but it looks like)