I am so glad Craig mentions https://buttondown.email. It is such a great service, and Justin (the creator of Buttondown) is engaged and friendly with his users.
I use Buttondown for my newsletter and would highly recommend it!
Oh, that's super cool. I write my newsletter emails in markdown, change them to HTML, and then publish them on mailchimp (which is a bit overkill for my 45 subscribers). Definitely going to check this out!
I use Buttondown also. It is not full-featured compared to MailChimp — I wouldn't use it for serious marketing or ecommerce — but it's beautifully streamlined for the purpose of maintaining a simple newsletter.
I use Buttondown for my newsletter and would highly recommend it!