Transactional & SMTP
Best Email APIs Compared (2026)
How to choose the best email API in 2026 without getting lost in feature checklists. Covers the eight evaluation criteria that actually predict deliverability, the four categories providers fall into and their tradeoffs, how to read API docs like an engineer, a REST-versus-SMTP comparison table, and a safe migration sequence.
Aug 14, 20269 min read