[aahhahahaaa]

There's not a cheap off the shelf solution because most companies offering comparable mass-email services spend a significant amount of resources to fight spam and care about deliverability rates.

Nice to have the option available, but making this too easy can be an organizational footgun if someone doesn't know what they're doing.

[TheRealPomax]

... making using email too easy is a footgun? When did we go from "reaching the people who want us to reach them is a good thing" to "email is spam"? If I sign up to a local, quasi-local, or even national grass roots movement, I want them to spend as little of my donation dollars on mailgun (or paying their CEO), and as much as possible on fighting injustice.

[aahhahahaaa]

Yes making mass-emailing too easy is a footgun. It's incredibly easy to get blocked by common email providers entirely if you make a simple omission or mistake. Third party senders do a fair amount of work to ensure deliveability is maintained (because it's critical to their business). If you don't have a workflow to deal with spam reports and list management then you'll very likely be sending your emails into a void.

Spam has effectively ruined DIY mass-emailing, whether you like it or not. There are multiple other providers if you don't like mailgun.

There are a lot of ways for organizations and non-profits to save money, and I wouldn't recommend doing so with email if it's important to them.