Spark Mail - Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues
Taco Digest - Customizable personal email newsletter created from your favorite sources.
TL;DR Email - Send short emails & read emails as fast as you read Facebook
Sponsor This Newsletter - 100+ newsletters ready to promote your product
mlist - Email newsletters, outside of the inbox
Stratechery - New layout, same great words about big tech