Skip to content
Agent Safety & Delivery ProtocolZero Staging Leakage

Autonomous email dispatch with native safety controls and approval holds

Give your multi-agent pipelines and autonomous workflows email sending powers with hardware-backed velocity bounds, domain filters, and audit transparency.

3,000 emails/month freeZero credit card requiredSub-20ms edge latency
100% Complete
Audit Trail
Model, prompt, key log
Built-in
Approval Queue
/app/approvals
6,000 / mo
Free Sends
No credit card needed
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
agent-dispatcher.ts
typescript
TYPESCRIPT
import { SadaSend } from 'sadasend';

const sadasend = new SadaSend(process.env.AGENT_SADASEND_KEY);

// Dispatch email with strict recipient domain filtering
const delivery = await sadasend.emails.send({
  from: 'agent@yourdomain.com',
  to: 'partner@verified-client.com',
  subject: 'Q3 Analytics Summary Ready',
  html: '<p>The automated Q3 forecast report has been compiled.</p>',
  requireApproval: false,
});

console.log('Dispatched with status:', delivery.status);

TypeScript SDK with typed safety policies, instant error feedback, and recipient domain validation.

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.

Granular Domain Allowlists

Restrict each agent key to specific recipient email patterns (e.g. *@clientcorp.com), blocking any out-of-bounds dispatch.

Human Approval Holds

Route high-stakes dispatches to the team dashboard for 1-click review and approval before delivery.

Agent Model Telemetry

Track model provenance (Claude 3.7, GPT-4o, DeepSeek) and prompt context alongside every email log.

Automated Loop Detection

Detect and trip circuit breakers on runaway loops before they trigger blacklists or consume budget.

Hosted MCP 2.0 Endpoint

Integrate directly with standard MCP clients without deploying containerized microservices.

low-latency Global Dispatch

High-performance edge infrastructure guarantees low latency responses for conversational agents.

Architectural Comparison

SadaSend vs Traditional Cloud Mailers (Postmark / SES)

Legacy email services treat autonomous AI agents like ordinary servers, with zero protection against prompt injections.

Feature & CapabilitySadaSendTraditional Cloud Mailers (Postmark / SES)
Autonomous Loop Circuit Breakers
Agent Key Recipient Restrictions
Built-in Human-in-the-Loop Holds
Hosted Model Context Protocol (MCP)
Per-Agent Usage QuotasAccount-wide only
Monthly Free Tier6,000 sends forever100 sends or paid
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 email API for AI agents

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

SadaSend lets you assign recipient allowlists to every API key. If the agent hallucinates or is prompted to send outside allowed domains, the request is immediately rejected.
Technical Deep Dives

Related developer guides and architectural tutorials

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

Documentation

AI coding agent rules (AGENTS.md, Cursor, Claude)

Setup instructions and rule files for AI coding agents: AGENTS.md, .cursorrules, CLAUDE.md, and hosted MCP configuration.

Read guide
Documentation

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.

Read guide
Documentation

REST API Reference & Endpoints

Complete REST API reference for sending emails, managing API keys, tracking delivery events, and configuring recipient allowlists with low latency.

Read guide
Deep Dive3 min read

How to Safely Let Agents Send Email: Defense-in-Depth for Autonomous Outbound

An engineering guide to defense-in-depth for autonomous email: preventing indirect prompt injection, infinite retry loops, and unverified recipient spam.

Read tutorial
Deep Dive8 min read

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.

Read tutorial
Deep Dive5 min read

Preventing Infinite Email Loops in Autonomous AI Agents: Circuit Breakers and Token Buckets

When two autonomous email agents start talking to each other, they can trigger an infinite email loop in minutes. Here is how to engineer circuit breakers, token buckets, and idempotency safeguards.

Read tutorial
Deep Dive3 min read

CrewAI Email Dispatcher Agent: Multi-Agent Workflows with Human Sign-Off

CrewAI lets multi-agent swarms collaborate on complex tasks. Learn how to isolate email sending into a dedicated role with human approval gates.

Read tutorial
Deep Dive5 min read

What actually happens when you give an AI agent your email API key

Every email MCP server on the market hands your agent the full platform. That is a capability claim with no control story — and it is the reason your engineering lead keeps saying no.

Read tutorial