There is Aweber for example (a hefty...at least for my budget at this time, $19 per month) and MailChimp (with some limitations on the free account).
I want neither.
I can build my own.
Does anyone know of any good guides online to building your own mail handler?
I don't need the fancy web interface and I don't need much of what these two offer. I just need the ability to send out HTML emails on a given schedule to those who have signed up to receive a newsletter. Double opt-in capability. I think that's really about it.