A better-auth plugin for in-app notifications. One plugin, one migration, one component — notifications live in your database, addressed to your users, with org-aware fan-out. No SaaS, no services to deploy.
React can't render HTML comments, so <!--[if mso]> is impossible. react-email-mso solves it in ~20 lines with custom elements and a string post-processor. Zero dependencies.
A CLI and library that validates email HTML against caniemail data for 30+ clients. React Email aware, CI-ready, with smart severity levels that don't drown you in noise.