I really like SendFox — at least everything I’ve used so far. It’s easy to create lists and emails, gives me info instantly, and setting up the domain was super simple. I think the delivery rate is excellent.
The only thing I’d improve is adding ready-made templates for specific types of emails, like Gmail does. It would also be great to have boxes or layout options to better organize text and images, or even design versions optimized separately for mobile and desktop. On mobile, I noticed the image and text don’t align properly sometimes.