Aahhh! This is something I am interested in as well. I don't have a definite answer but a few vintage points and directions in which you can start your journey and find more stuff from there - https://thehistoryoftheweb.com/ - https://textfiles.com/ If you are searching for Pre Main stream internet, you can start with BBS - https://www.youtube.com/playlist?list=PL7nj3G6Jpv2G6Gp6NvN1kUtQuW8QshBWE If you are looking... - Source: Hacker News / almost 2 years ago

You can also sign up for my newsletter, where I regularly sound out stories about web history and new additions to the (still growing) timeline! https://thehistoryoftheweb.com/. - Source: Hacker News / almost 3 years ago

And even more in depth at https://thehistoryoftheweb.com/. Source: about 3 years ago

Do you guys have any feedback about https://letterwell.co allowing to find sponsors? I would be interested to know if it's effectively used by some newsletter creators. Source: over 2 years ago

I haven't found one for larger newsletters, would be a great resource.. I know of some sites that allow newsletter owners to sign-up to find advertisers/sponsors: https://store.tryletterhead.com/ and https://letterwell.co/. Source: about 3 years ago

Hey, I'm looking for newsletters where I can advertise my website and I wanted to ask if you know cool publishers who offer this in their newsletters? (something different from letterwell.co) Thanks in advance! Source: about 3 years ago

Been working on https://letterwell.co for a while now. Got 400+ email newsletters on the site and it's growing pretty steadily. Seen some unexpectedly good results for advertisers reporting higher ROI than Fb/IG ads... Source: about 3 years ago

A great email marketing resource is https://letterwell.co Loads of super successful email newsletters on there making quite a lot of money. Source: about 3 years ago