Transactional Email API & SMTP Relay Service in India
Deliver critical OTPs, password resets, payment receipts, and system alerts to Indian customer inboxes in under 2 seconds. Simple REST API, automated DKIM/SPF verification, isolated domain reputation, and INR billing via Razorpay with 18% GST invoices.
API Latency
< 90 ms
Edge-optimized request handling
Delivery Speed
< 1.8 seconds
Direct inbox arrival for OTPs
Integration
REST + SMTP
Works with all frameworks & SDKs
Billing
₹ INR Direct
Zero foreign conversion fees
Developer-First Integration: Send an Email in 4 Lines of Code
Integrate KiteCampaigns into your application using your favorite language or standard SMTP.
curl -X POST https://api.kitecampaigns.com/v1/campaigns \
-H "Authorization: Bearer kc_live_79a2b8e3..." \
-H "Content-Type: application/json" \
-d '{
"subject": "Your Verification Code: 492019",
"html": "<p>Hello! Your login code is <strong>492019</strong>.</p>",
"domain_id": "dom_india_981a",
"audience": { "all": true },
"delete_contacts_after_send": false
}'Lightning-Fast Sub-Second Email Delivery for OTPs, Alerts & Notifications
When customers sign up or request an OTP, every second counts. KiteCampaigns ensures your critical messages never get delayed in sluggish queues.
One-Time Passwords (OTPs)
Ensure authentication codes and login links arrive within seconds so users never abandon your registration or checkout flows.
Invoices & Payment Receipts
Dispatch Razorpay, Stripe, or Cashfree transaction receipts, subscription confirmations, and billing invoices automatically.
Security Alerts & Resets
Notify users of unusual logins, password changes, and account security notices immediately to build user confidence.
Why Indian Developers Switch from SendGrid & Mailgun to KiteCampaigns
Built by developers for developers, solving the real pain points Indian engineering teams face daily.
No Sudden Account Freezes
Global platforms use aggressive AI heuristics that frequently suspend legitimate Indian tech startups during high-traffic launches. With KiteCampaigns, you have transparent metric thresholds (4% bounce, 0.1% complaint) and direct developer support.
Clean Corporate Invoicing in INR
Finance and accounting teams love KiteCampaigns. No corporate credit card international fee charges, no 2% currency fluctuations, and zero TDS/GST reverse charge compliance confusion. Download clean 18% GST tax invoices each month.
Frequently Asked Questions About Transactional Email in India
Common developer questions about API integration, delivery speeds, and limits.
- How fast are transactional emails delivered to Indian mailboxes?
- KiteCampaigns processes transactional API requests with sub-100ms API latency and routes them through optimized Indian and international sending pathways, resulting in average inbox delivery times of under 1.8 seconds for OTPs, magic links, and login verifications.
- How does KiteCampaigns compare to Mailgun and SendGrid for transactional sending?
- Mailgun and SendGrid bill in USD, meaning Indian businesses incur currency conversion charges, bank foreign markup fees, and reverse-charge GST. Furthermore, sudden account locks without local human support can cripple your app’s signups. KiteCampaigns offers transparent INR billing, instant GST invoices, isolated domain reputation, and local support.
- Can I send transactional emails using both REST API and SMTP?
- Yes. You can send transactional emails directly using our clean JSON REST API with API keys or configure standard SMTP credentials in any framework (Django, Laravel, Rails, Express, Next.js, WordPress, etc.).
- How are bounces and delivery failures handled for transactional emails?
- Our platform automatically captures delivery status, bounces, and spam complaints. Hard bounces are suppressed immediately to protect your sender score and prevent wasting quota on nonexistent addresses.
Integrate Transactional Emails into Your Indian App Today
Create your account in minutes. Get immediate API access, verify your domain, and start sending high-speed transactional emails.