I read them in Feedbin. It provides me with a dedicated mail address and allows me to read newsletters as if they were RSS feeds.

Highly recommend the Thinking About Things newsletter [0], it's one link every other day.

[0] https://thinking-about-things.com

I use https://kill-the-newsletter.com/ to get an RSS feed :-)

Ya I sometimes just keep track of newsletters I like in a doc, then make the rounds when I'm in a reading mood

Edit: nevermind, I might promote it when it's more generally available.