EmailOctopus is a complex, powerful tool, but it lacks some of the most important features that you need when you're building a newsletter.
Buttondown is a more light-weight tool that gives you the same ease of use as EmailOctopus, as well as support for features like:
|Free for your first hundred subscribers|
|Drag and drop image uploading|
|Free RSS support|
|Clean, usable design|
|'Pay what you want' mode|