Resources
Password resets, receipts, and launch emails need a real ESP, not a random SMTP relay. Split transactional vs audience email when you can. This list sticks to tools with sane APIs or founder-friendly newsletters, not enterprise marketing clouds.
8 of 8 tools shown
Loops
Email for SaaS, transactional + marketing loops aimed at product founders.
Resend
Developer-first transactional email API with React email templates.
Beehiiv
Newsletter platform for building an audience alongside your product.
Buttondown
Simple, writer-friendly newsletters without marketing-suite bloat.
ConvertKit
Creator-friendly email marketing (Kit) for courses, launches, and audiences.
Customer.io
Behavior-based messaging when onboarding sequences outgrow basic ESP tools.
Plunk
Open-source and affordable email platform option for indie products.
Postmark
Transactional email focused on deliverability for product messages that must arrive.