# MailSetu

> Transactional email, SMS, and OTP APIs with INR pricing, GST invoices, UPI billing, and AI-ready setup.

MailSetu is an India-first developer communications platform.
It offers transactional email, SMS, OTP / verification APIs, inbound handling, SMTP relay, templates, webhooks, audit tools, and AI-agent-safe install flows.

## Best starting points
- Home: https://mailssetu.in/
- SmsSetu: https://mailssetu.in/smssetu
- Docs: https://mailssetu.in/docs
- Quickstart: https://mailssetu.in/docs/quickstart
- SMS Quickstart: https://mailssetu.in/docs/sms
- OTP / Verify: https://mailssetu.in/docs/otp
- AI Agent Setup: https://mailssetu.in/docs/agents
- Integrations: https://mailssetu.in/integrations
- SDKs: https://mailssetu.in/sdks
- Pricing: https://mailssetu.in/pricing

## Core products
- MailSetu: transactional email API, templates, domains, logs, inbound, and webhooks.
- SmsSetu: SMS API, OTP / verification, message logs, and SMS-first onboarding.
- Shared account model: teams can start with email only, SMS only, or both together.

## Important operational truths
- Sandbox keys are safe for integration testing and log activity, but they do not deliver to real inboxes or phones.
- Live delivery requires live credentials and verified provider setup.
- AI agents should prefer the dedicated agent docs and install-token flow instead of asking users for permanent owner credentials.

## Who MailSetu is for
- Indian startups that want INR pricing, GST invoices, and UPI-friendly billing.
- Global product teams that want a simpler transactional email + SMS control plane.
- AI agents and setup assistants that need a machine-readable integration surface.

## Support
- Email: support@mailssetu.in
- Help: https://mailssetu.in/help