MailCheap is an open-source newsletter app that AI agents can run

MailCheap, from GitHub developer marclou, is an open-source newsletter app. You can self-host it for free with your own Amazon SES or PostShiba sending account, or use the hosted version from $19 a month. The pitch is cost: you pay per email sent, not per subscriber, so 10,000 readers and four issues a month is 40,000 emails, about $4 to $6 on SES. It includes an editor, signup forms, confirmed opt-in, unsubscribe and bounce handling, list cleanup, staged sends and stats. Every dashboard action also works through a REST API and an MCP server, so an AI agent can draft and send issues. The repo says plainly there is no support.