HTML Email Tester
MintyEmailTester.com
I created this as an alternative to Litmus Putsmail with added tools and features. Full-stack email testing SaaS built with Python Flask, JavaScript, and responsive HTML/CSS. Helps email developers test campaigns across 30+ email clients with automated CSS inlining, accessibility checks, and CSV link merging for efficient workflow management. Features: Saved recipient groups, file size validation, browser preview, Stripe subscription management, Postmark SMTP delivery. Tech: Flask, PostgreSQL, JavaScript, user authentication, deployed on DigitalOcean with SSL. Serving paying customers ($9/month) with active usage from email development community.