Drive growth with newsletter sponsorships at scale.

 https://www.swapstack.co/

matching newsletter publishers and advertisers

SponsorGap is where newsletter and website creators find their next sponsor, post their open ad slots and brands publish their open sponsorships.

 https://sponsorgap.com/

Newsletter and website sponsor marketplace. 

Facebook announces Bulletin, its Substack newsletter competitor

 https://www.theverge.com/2021/6/29/22555957/facebook-bulletin-newsletter-subscriptions-substack-competitor

Because there's a pie out there and FB wants a piece of it? 

Master the art of creating & running a newsletter

 https://newsletteros.com/

Probably one of the simplest subscription models, often overlooked. 

Newsletter crew

  https://newslettercrew.com/

a podcast about newsletter publishing

THE MARKETER'S #1 DAILY NEWSLETTER.

 https://www.stackedmarketer.com/

Curated internet marketing content

Email digests on things you love

https://mailbrew.com/
We'll see how smart it is.