I have a client who wants to send an HTML newsletter out to folks who subscribe through their website. I’ve had a hard time finding anything like this out there and I’m hoping someone here can help. Most of the stuff that I’ve found is either of the majordomo variety (allowing readers to also post messages) or is designed for mass-mail spammers. All I need is something that will collect subscribers names and manage the process of sending a newsletter out to them. Any suggestions for an off the shelf product?