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Modern Transactional Cloud Servicelow-latency Delivery · DKIM Aligned

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.

3,000 emails/month freeZero credit card requiredSub-20ms edge latency
202 Accepted
Dispatch Latency
Queued durably before any provider call
SPF · DKIM · DMARC
Authentication
Aligned on every send
6,000
Free Monthly Sends
Custom domain DKIM
Developer Ergonomics

Drop into your application in under 60 seconds

Native typed interfaces with zero unnecessary dependencies. Built for standard fetch and modern edge runtimes.

$npm install sadasend
send-transactional.ts
typescript
TYPESCRIPT
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.

Core Infrastructure

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.

Architectural Comparison

SadaSend vs Legacy Marketing & Transactional Hybrids

Why engineering teams switch to dedicated transactional infrastructure rather than bulk marketing hybrid platforms.

Feature & CapabilitySadaSendLegacy Marketing & Transactional Hybrids
Traffic Stream Isolation100% Dedicated TransactionalMixed with bulk marketing newsletters
Dedicated IP Surcharges$0 (Automated smart pools)$89.95/month extra per IP
AI Agent & MCP Tooling
Synchronous Error HandlingSilent queue drops
low-latency Ingestion LatencyQueue lag during promo bursts
Permanent Free Tier6,000 sends foreverTrial expiration or credit card required
Forever Free Tier
Transparent Economics

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.

3,000 dispatches monthly forever with zero credit card
All safety gates, allowlists, and velocity limits included
Scale seamlessly: Starter ($12/mo for 10k), Pro ($19/mo for 50k), Scale ($79/mo for 250k)
Free Developer Plan
$0 / mo

No credit card required

Create Free AccountCompare all paid plan tiers
Frequently Asked Questions

Everything you need to know about transactional email service

Clear, transparent answers on deliverability, API authentication, and rate limits.

A transactional email service delivers automated, one-to-one messages triggered by user actions, such as password resets, order confirmations, two-factor authentication codes, and security alerts.
Technical Deep Dives

Related developer guides and architectural tutorials

Explore step-by-step production implementation blueprints, benchmarks, and protocols.