I agree, you can also visit https://inboxreads.co/ for more resources. Source: about 1 year ago

I have tried a few, the ones which seem to be active and I get cross promo pairing emails from - https://crosspromote.io - https://www.radletters.com - https://inboxreads.co. Source: about 1 year ago

Mine is a mixed bag. I write about art history, general history, archaeology, semantics, philosophy, religion. I’ve been swamped with work lately and have only been able to put up two posts so far. However, I have had great success with generating subscribes through inboxreads.co. I have 80 subscribers with just those two posts. I don’t really market myself elsewhere. Source: about 1 year ago

My newsletter got on there about a year ago, but struggling to get some details updated for the better part of 6 months. But the real winner for us is Inbox Reads, accounts for at least 15% of our subs. Source: over 1 year ago

Here's a great list to get some options: https://inboxreads.co/. Source: over 2 years ago

You can find more charts and stats in the blog post and the full report: https://codingsans.com/blog/software-development-trends. Source: about 3 years ago