I don't actually have a mailing list yet, it's one of many jobs on my to do list. But NO, i would never add someone to a list and send them emails without asking first if they want to receive them. Surley if a person hasn't activley opted in to getting those emails they're spam? That's how I view them anyway, I think it's better to have a mailing list of 20 people that look forward to getting your mails and actually read the content than 200 that just delete it without even reading it.