A transactional email API that actually works for India
INR pricing, GST invoices, UPI payments, built-in SMS and OTP — everything Indian teams need from a developer communications platform, without overseas billing friction.
What you get with MailsSetu
Built for developers who want to ship communications fast and correctly.
INR billing with UPI and net banking
Pay in Indian rupees via UPI, debit card, or net banking through Razorpay. No international card, no forex fees, no currency conversion surprises.
GST-compliant invoices, automatically
Every invoice is GST-ready and legally compliant for Indian businesses. Includes GSTIN on invoices. No manual paperwork or custom invoice requests.
Email + SMS + OTP from one API key
Send transactional email, SMS, and OTP verification from a single account and credential. No need to wire together three separate vendors.
Sandbox mode from signup — no domain needed
Your sandbox key works the moment you sign up. Test your entire integration — email, SMS, OTP, webhooks — before touching DNS or production credentials.
Retry-safe with idempotency keys
Pass an idempotency key with any send. MailsSetu deduplicates within 24 hours so retries on network failures never result in duplicate messages.
AI-agent-ready install flow
Short-lived install tokens let AI coding assistants and deployment pipelines set up MailsSetu without ever receiving your permanent credentials.
Simple INR pricing
Flat-rate monthly plans. No per-email surprise charges above quota.
SMS credits and top-up email credits available separately. GST applied on all invoices. UPI · Debit/credit cards · Net banking accepted.
India-first. Not India-as-an-afterthought.
MailsSetu is the only transactional email API designed specifically for Indian startups — with INR pricing, UPI billing, GST invoices, and India-based support built in from day one.
GSTIN 29AANCR6717K1ZN · Mumbai, Maharashtra · Managed delivery stack
Start sending in minutes
Free tier: 3,000 emails/month. Sandbox mode works immediately, and paid plans start from ₹399/month when you are ready to go live.
Explore more
See the intent page built for API-first sending, SMTP relay, and developer workflows.
Move from pricing research to a real send flow with a sandbox key and verified domain plan.
Learn how SPF, DKIM, DMARC, bounce handling, and reputation affect real inbox placement.