Equip CrewAI agent teams with safe email capabilities with human-in-the-loop review
Let autonomous agent crews draft, verify, and dispatch transactional emails without risk. Built-in human approval mode holds high-stakes emails in your operator queue for inspection before delivery.
Drop into your application in under 60 seconds
Native typed interfaces with zero unnecessary dependencies. Built for standard fetch and modern edge runtimes.
import os
from crewai.tools import tool
from sadasend import SadaSend
client = SadaSend(api_key=os.environ["SADASEND_API_KEY"])
@tool("Send Customer Update Email")
def send_customer_update(recipient: str, subject: str, content: str) -> str:
"""Dispatches a transactional customer update email via SadaSend.
Held in human approval queue if approval_required is enabled on the key.
"""
res = client.emails.send(
from_email="updates@yourdomain.com",
to=recipient,
subject=subject,
html=f"<div style='font-family: sans-serif;'>{content}</div>",
tags=["crewai-task"]
)
return f"Email submitted. Dispatch ID: {res.id}"Custom CrewAI tool decorated with @tool for multi-agent delegation across Researcher, Writer, and Dispatcher roles.
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.
Multi-Agent Delegation Architecture
Separate responsibilities cleanly: let research agents draft email copy while dedicated communication agents execute dispatches.
Human-in-the-Loop Review Mode
Hold agent-composed emails in your SadaSend dashboard queue for review before actual delivery to real customer inboxes.
Domain & Recipient Sandboxes
Restrict test crew runs to company email domains to guarantee developmental agent mistakes never impact real clients.
Velocity Protection Circuit Breakers
Prevent rogue agent loops across multiple crew iterations from burning sending quotas or triggering spam filters.
Full Audit Trail for SOC 2
Track which agent executed each dispatch, the prompt parameters used, and synchronous delivery confirmation IDs.
6,000 Free Monthly Sends
Deploy your CrewAI multi-agent crews with production-ready DKIM and 6,000 free sends every month.
SadaSend vs Unchecked SMTP Relays in CrewAI
Why multi-agent AI engineers use SadaSend rather than unmonitored SMTP credentials that risk accidental customer spam.
| Feature & Capability | SadaSend | Unchecked SMTP Relays in CrewAI |
|---|---|---|
| Human Approval Queue Hold | Emails sent immediately with no review | |
| Multi-Agent Loop Protection | Velocity tripwire halts bursts | Agents send infinite emails in loops |
| Recipient Domain Allowlists | ||
| Custom DKIM Signing on Free Tier | Requires expensive enterprise upgrade | |
| Python Tool Decorator Support | ||
| Permanent Free Tier | 6,000 sends forever | Trial 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 CrewAI 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.
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.
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.
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.
LangChain Email Tool Calling: Safe Integration with Recipient Allowlists
Connecting LangChain agents to raw SMTP credentials risks uncontrolled outbound email. Here is the architectural guide to building safe email tools using Pydantic schemas and scoped credentials.
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.
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.