hmm. don't know of any mass mailers that are free but if you have a server you can run a script on you can use php to mass mail someone.
have a database with all of the email address you need and then use an
fck editor field to create your pretty emails and then use the php mail() function with a loop to email to all of the addresses.
if you are interested in doing this post again and i will help you figure it out
eric