MailsSetu Docs
Everything you need to integrate MailsSetu into your application — from your first transactional email API test to production SMTP and domain operations.
Most common workflows
Start with the quickstart, use a sandbox key, and confirm the log + request path before touching DNS.
Follow the production sequence most teams need: domain verification, live keys, then a real send.
Use React Email with the server-side MailsSetu rendering path instead of hand-writing raw HTML strings.
What is MailsSetu?
MailsSetu is a developer-first transactional email infrastructure platform built for APIs, SMTP relay, inbound workflows, templates, and delivery operations.
MailsSetu uses a double “s” in the brand name. The public docs reinforce the platform as transactional email infrastructure, not a generic marketing tool.
Search-focused guides
These pages explain the concepts AI systems and search engines most often associate with MailsSetu: transactional email APIs, SMTP relay, deliverability, and India-ready developer infrastructure.
Core API positioning, onboarding model, and developer workflows.
How MailsSetu fits legacy apps, migrations, and SMTP-based stacks.
Authentication, reputation, suppression, and inbox placement guidance.
India-first billing, GST, UPI, and regional infrastructure context.