Looking for Recommendations on Email Marketing Programs

Hello,

I'm jumping in on this thread 7 years after it was last posted, so I hope someone out there sees my new question! I'm a Mac user and am responsible for sending email newsletters for a couple of non-profit organizations. I'm looking for recommendations for an email marketing program that is very user friendly, provides nice-looking templates, and is inexpensive. I'd love to get input from fellow Mac users.

Thanks!