AgentMail

100

Programmatic email API for AI agents — create inboxes, send/receive messages, and manage threads with simple API key auth.

OpenAPI SpecAPI KeyFreemiumJSONBot Blocking: NoneNo CCemailai-agentsinboxeswebhooksthreading

Pros

+ Purpose-built for AI agents — no OAuth flows, just API key auth and instant inbox creation
+ Full two-way email with threading, labels, and webhooks for event-driven agent workflows
+ Typed SDKs for Python, TypeScript, and Go with idempotent request support

Cons

- Free tier is restrictive (3 inboxes, 100 emails/day)
- No custom domains on free plan — agents send from agentmail.to addresses

Integration

example.py

from agentmail import AgentMail
client = AgentMail(api_key="am_...")inbox = client.inboxes.create()client.inboxes.messages.send(    inbox.inbox_id,    to="[email protected]",    subject="Hello",    text="Hello from my agent!")

Documentation Website

Details

Category: Email
Pricing: Freemium
Free Tier: 3 inboxes, 3,000 emails/month, 100 emails/day
Rate Limit: 100 emails/day on free tier; no rate limits on paid plans
Verified: 2026-03-31

Score Breakdown

Base +50

OpenAPI Spec (Yes) +15

Auth Complexity (API Key) +10

Response Format (JSON) +10

Bot Blocking (None) +10

No Credit Card (Yes) +5

Completely Free (No) 0

Total 100