The transactional email service engineered for modern software engineering teams
Deliver password resets, order notifications, magic links, and AI agent messages reliably. High-deliverability cloud infrastructure with transparent pricing, honest error codes, and zero bloat.
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!);
export async function sendTransactionalAlert(to: string, message: string) {
const result = await sadasend.emails.send({
from: 'Security <security@yourdomain.com>',
to,
subject: 'Security Alert: New Sign-in from Chrome on macOS',
html: `<p>${message}</p><p>If this was not you, lock your account immediately.</p>`,
tags: ['security-alert']
});
console.log('Transactional email accepted:', result.id);
return result;
}fast transactional email dispatch with synchronous message ID return and automatic delivery status tracking.
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.
Dedicated Transactional Stream
We never mix promotional newsletter traffic with transactional messages, safeguarding your critical auth notifications.
Synchronous API Error Contracts
Get immediate feedback on invalid addresses or policy violations rather than ambiguous 202 Accepted drops.
Automated Inbound & Outbound Webhooks
Stream delivered, open, click, bounce, and complaint events into your application with cryptographic HMAC verification.
Autonomous AI Agent Governance
Empower AI agents with scoped API keys, recipient allowlists, hourly tripwires, and 10 hosted MCP tools.
Custom Domain Reputation Shield
Verify your domain once with automated DNS guidance (DKIM, SPF, DMARC) and maintain pristine inbox placement.
6,000 Free Monthly Sends
Permanent developer plan with full production features, custom domains, and webhook monitoring included.
SadaSend vs Legacy Marketing & Transactional Hybrids
Why engineering teams switch to dedicated transactional infrastructure rather than bulk marketing hybrid platforms.
| Feature & Capability | SadaSend | Legacy Marketing & Transactional Hybrids |
|---|---|---|
| Traffic Stream Isolation | 100% Dedicated Transactional | Mixed with bulk marketing newsletters |
| Dedicated IP Surcharges | $0 (Automated smart pools) | $89.95/month extra per IP |
| AI Agent & MCP Tooling | ||
| Synchronous Error Handling | Silent queue drops | |
| low-latency Ingestion Latency | Queue lag during promo bursts | |
| Permanent Free Tier | 6,000 sends forever | Trial expiration or credit card required |
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 service
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.
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.
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.
Dedicated IP vs Shared IP for Email: When Do You Actually Need One?
Think a dedicated IP will magically fix your deliverability? If you send under 100,000 emails a month, a dedicated IP will actually hurt your inbox placement. Here is the math.
Gmail, Yahoo and Microsoft now reject non-compliant mail. The 2026 checklist
The consequence changed. Non-compliant mail used to land in spam, where you might eventually notice. It is now refused at the door.
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.