MailCheap is an open-source newsletter application designed to run on your own infrastructure using Amazon SES or PostShiba. It handles writing, subscriber imports from platforms like Substack and Beehiiv, and automated deliverability protections like warm-ups and list hygiene. You can operate the entire app via a web dashboard, REST API, or an MCP server for AI agents.
It is worth setting up if you want to stop paying subscription fees for dormant subscribers and prefer managing your own sending infrastructure. The main catch is that self-hosting requires configuring DNS, DKIM records, and dealing with SES production access yourself, with zero support issues tracked if something breaks.
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