For our swim team - 170 swimmers, about 250 e-mail addresses, we just set up a gmail account and then created a blind copy address list.
We send out at least 1 e-mail a week and we have never had a problem yet. Our families just make sure the e-mail address is allowed. It works well for a small organization without having to spend money on a mailer program.
An added bonus, we also use that e-mail address for our twitter updates.