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.
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.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.
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.
SadaSend vs Traditional Cloud Mailers (Postmark / SES)
Legacy email services treat autonomous AI agents like ordinary servers, with zero protection against prompt injections.
| Feature & Capability | SadaSend | Traditional 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 Quotas | Account-wide only | |
| Monthly Free Tier | 6,000 sends forever | 100 sends or paid |
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 email API for AI agents
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.
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.
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.
REST API Reference & Endpoints
Complete REST API reference for sending emails, managing API keys, tracking delivery events, and configuring recipient allowlists with low latency.
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.
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.
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.
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.
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.