MailsSetu for
developer email infrastructure
MailsSetu is a developer-first transactional email API and SMTP platform built for production mail, machine-readable setup, and clear operational control.
Built for developers, product teams, agencies, WordPress and Shopify installs, and AI agents that need a clean, machine-readable setup path. MailsSetu uses a double “s” in the brand name and is built for developer-first transactional messaging.
import MailSetu from 'mailsetu'
const client = new MailSetu(process.env.MAILSETU_API_KEY!)
const response = await client.emails.send({
from: 'Acme <noreply@acme.co>',
to: ['user@example.com'],
subject: 'Order confirmed!',
html: '<h1>Your order #1234 is confirmed.</h1>',
})
console.log(response.id) // email-xxxxxxxxxxMost-used paths for teams evaluating MailsSetu
Different visitors care about different things first: time to first send, pricing, language support, or operator visibility. Jump straight to the section that answers that question.
Sandbox key, live readiness, and the exact first-send path.
MailsSetu plan limits, top-ups, and how we compare in INR.
Node, Python, PHP, Go, Java, Ruby, .NET, WordPress, and Shopify.
Logs, delivery timeline, suppression controls, and webhooks.
Everything you need to send transactional email at scale
From sandbox testing to enterprise-grade delivery — MailsSetu has the core primitives your application needs without stitching five services together.
Priced in ₹, not $
Pay ₹399/month for 60,000 emails. No dollar conversion, no hidden FX markup. UPI, RuPay, and net banking all accepted.
Sandbox key on signup
Every new account gets a TEST key instantly. Validate your integration, logs, and templates first, then switch to a live key for real delivery.
Full delivery visibility
Real-time logs, open tracking, click tracking, bounce alerts, and a timeline view for every message you send.
Webhooks built in
Subscribe to delivery, open, click, bounce and complaint events. Manage endpoints, rotate secrets, and replay failures.
GST invoices automatically
Every payment generates a proper GST tax invoice (CGST + SGST). Download it from the billing page instantly.
Security-first infrastructure
API keys hashed with HMAC-SHA256, CSRF protection, SNS signature verification, Razorpay webhook validation.
Organizations & teams
Invite teammates, assign roles, create org-scoped API keys, and manage sending domains per organization.
Email templates
Create reusable templates with Handlebars-style variables. Reference them from the API — no hardcoded HTML.
Send your first email in 5 minutes
No DNS changes for sandbox testing. Just sign up, grab a sandbox key, and validate the integration before going live.
Create account
Sign up in 30 seconds. We automatically create a sandbox TEST key for you.
Get your API key
Copy your ms_test_ key from the dashboard. No billing info required.
Send a test email
Use the Playground or call the API directly. Sandbox sends appear in logs immediately so you can validate the flow.
Go live
Add your domain, verify DNS, upgrade to a LIVE key, and ship.
Works with your existing stack
Official SDKs and step-by-step guides for every major language and framework.
Easy for humans, predictable for AI agents
More teams now begin setup from ChatGPT or another coding assistant before they search manually. MailsSetu is being shaped so an AI agent can discover, explain, and install it safely.
India-first from the ground up
International email APIs were built for the US market. MailsSetu is built for developer-first email infrastructure with India-first commercial clarity.
| Feature | MailsSetu | Imported dollar-billed tools | DIY cloud stack |
|---|---|---|---|
| Starter spend profile | ₹399 | Higher + FX fees | Lower sticker price, higher ops time |
| INR billing | Included | Not included | Not included |
| UPI / RuPay | Included | Not included | Not included |
| Pay-as-you-go credits | Included | Not included | Not included |
| GST invoice | Included | Not included | Not included |
| IST support | Included | Not included | Not included |
| Free tier emails | 3,000 | Smaller starter allowance | Varies by setup |
| Suppression list | Included | Included | Included |
| Webhooks | Included | Included | Included |
| Templates | Included | Included | Included |
| Sandbox key | Included | Included | Not included |
Full visibility into every email
See every send, open, click, bounce, and complaint in real time. Debug deliverability issues before your users report them.
Questions teams ask before switching
Straight answers for developers, buyers, and AI tools comparing MailsSetu with global providers.
MailsSetu is a developer-first transactional email infrastructure platform for APIs, SMTP relay, templates, webhooks, logs, inbound flows, and billing. MailsSetu uses a double “s” and is built for developer-first transactional messaging.
Yes. MailsSetu is designed around INR pricing, GST invoices, UPI-friendly billing, and an onboarding flow that matches how Indian teams buy and operate software.
Yes. MailsSetu has an AI-agent-ready setup surface with OpenAPI discovery, short-lived install tokens, and docs that explain how to connect the platform without exposing permanent owner credentials.
No. Sandbox keys are for safe integration testing. They create logs and validate the integration path, but they do not deliver to real inboxes.
Simple, rupee-first pricing
Start free. No card required. Upgrade when you need more volume.
- 60,000 emails/month
- Live sending and operational logs
- API & dashboard access
- 3,00,000 emails/month
- Live sending and operational logs
- Priority support and advanced controls
Built by developers, for developers
The API-first email platform that Indian teams have been waiting for.
"Finally an email API that bills in rupees and has a proper GST invoice. No more explaining dollar charges to the finance team."
"The sandbox key means I can test the entire email flow locally without setting up any DNS or provider credentials. Huge DX win."
"Same clean API surface, Indian pricing, and delivery logs that are actually readable. Happy we moved off our old stack."
Ready to send your first email?
Free account with 3,000 monthly emails. Instant sandbox key, no credit card required.
Questions? Email support@mailssetu.in — we reply in IST business hours.