<a href="https://buttondown.email/" rel="nofollow">https://buttondown.email/</a><p>I haven't used it yet, but I'm planning to use it for a personal project. I like that it has built-in support for Markdown.
Mailchimp has turned out to be chock-full of functionality for my first experiments with a drip email marketing/educational campaign for my resume/LinkedIn Profiles/career counseling biz. Free up to 2000 subs and a ton of different templates to choose from.
For a simple mailing list, I'd use TinyLetter or buttondown.email, they are both great. The latter lets you write in Markdown, pretty convenient.<p>Seva (formerly ConvertKit) if you need more automation and you need to manage different segments.
mailchimp is free for small projects<p><a href="https://mailchimp.com/pricing/" rel="nofollow">https://mailchimp.com/pricing/</a>