Transactional email API engineered for developers and AI workflows
Deliver verification codes, password resets, and notifications with fast dispatch, per-key recipient allowlists, and native Model Context Protocol tools.
Drop into your application in under 60 seconds
Native typed interfaces with zero unnecessary dependencies. Built for standard fetch and modern edge runtimes.
import { SadaSend } from 'sadasend';
const sadasend = new SadaSend(process.env.SADASEND_API_KEY);
const result = await sadasend.emails.send({
from: 'notifications@yourdomain.com',
to: 'user@example.com',
subject: 'Your Verification Code',
html: '<p>Your one-time login code is <strong>839201</strong>.</p>',
tags: ['auth', 'verification'],
});
console.log('Dispatched successfully:', result.id);Native global fetch implementation with complete TypeScript types and automatic idempotency key handling.
Engineered for high deliverability and zero incident risk
Every layer from edge connection pooling to per-key rate limits is designed to keep critical transactional dispatches fast, reliable, and contained.
Per-Key Recipient Allowlists
Restrict developer and agent API keys to internal corporate domains (@company.com) to eliminate staging leakage to customers.
Velocity Circuit Breakers
Hardware-rate-limited sending bounds protect your domain reputation from infinite loops and prompt injection exfiltration.
Hosted MCP 2.0 Integration
Equip Claude, Cursor, and autonomous agents with 10 native email tools without writing custom backend wrapper servers.
low-latency Edge Dispatch
Global edge connection pooling across distributed nodes guarantees immediate acceptance and high-speed delivery.
Zero Dedicated IP Surcharges
Enjoy enterprise deliverability and automated IP reputation management without legacy $89+/month add-on surcharges.
RFC 8058 One-Click Unsubscribe
Automated headers and HTTPS unsubscribe endpoints ensure 100% compliance with Gmail and Yahoo sender mandates.
SadaSend vs Legacy Providers (SendGrid / Mailgun)
Compare modern agent-ready email infrastructure against legacy SMTP architectures.
| Feature & Capability | SadaSend | Legacy Providers (SendGrid / Mailgun) |
|---|---|---|
| Dispatch | One HTTP round trip, then queued | 150 - 300ms |
| Per-Key Recipient Allowlists | ||
| Native Hosted MCP Server | ||
| Dedicated IP Monthly Surcharge | $0 / included on Pro | $89.95 / month |
| Silent HTTP 202 Drops | 0 (Synchronous Verification) | Common on legacy queues |
| Free Tier with Full Features | 6,000 / mo forever | 100 / day or trial expiring |
Start with 3,000 emails every month at zero cost
No artificial paywalls on security. Unlike legacy providers that reserve recipient allowlists or dedicated IP pools for high enterprise tiers, every SadaSend account receives full safety controls from day one.
Everything you need to know about transactional email api
Clear, transparent answers on deliverability, API authentication, and rate limits.
Related developer guides and architectural tutorials
Explore step-by-step production implementation blueprints, benchmarks, and protocols.
REST API Reference & Endpoints
Complete REST API reference for sending emails, managing API keys, tracking delivery events, and configuring recipient allowlists with low latency.
Official Client SDKs (TypeScript & Python)
Official zero-dependency client SDKs for SadaSend. TypeScript and Python packages are live on npm and PyPI with typed results and auto-idempotency.
Model Context Protocol (MCP) Server
Connect AI agents directly to SadaSend via Model Context Protocol (MCP). Inspect tools, configure execution scopes, and enable human approval holds.
Best Email API for AI Agents: 2026 Evaluation · SadaSend
Agents break traditional email APIs by retrying blindly, improvising addresses, and falling for prompt injections. Here is the evaluation matrix for agent-ready email infrastructure.
How to Give an AI Agent Email Access Without Handing Over Your Whole Account
Step-by-step tutorial on minting a scoped agent key, setting up domain allowlists, and integrating email tools into LangChain, CrewAI, and TypeScript loops safely.
SendGrid 202 Accepted But No Email: Root Causes & The Fix
Getting HTTP 202 Accepted from SendGrid but the recipient never receives the email? Here is the deep technical anatomy of silent queue drops and how to fix them.
Why your transactional email goes to spam
People assume transactional mail is exempt from filtering because it was requested. Mailbox providers do not know that, and mostly do not care.
SPF, DKIM and DMARC: what each one actually does
Three records, endlessly confused with each other. Here is the mental model that makes them stop being confusing, and the two mistakes that cause most failures.