AgentMail
agentmail.to
An email API that gives AI agents their own inboxes to send, receive, reply to, search, and manage threaded email conversations programmatically.
The AgentMail API uses Bearer token authentication; has freemium pricing; offers a free tier ($0/month — 3 inboxes, 3,000 emails/month, 3 GB storage, no credit card required); rate limits: Emails/day limits per plan (Free 100/day, Developer 1,000/day, Startup/Enterprise no limit); exceeding returns 429 with Retry-After header. Verified 2026-08-03 with per-field source links.
Free tier
$0/month — 3 inboxes, 3,000 emails/month, 3 GB storage, no credit card required
agentmail.to ↗Pricing
Free $0/mo; Developer $20/mo (10 inboxes, 10,000 emails/mo, 10GB); Startup $200/mo (150 inboxes, 150,000 emails/mo, 150GB); Enterprise custom
agentmail.to ↗Rate limits
Emails/day limits per plan (Free 100/day, Developer 1,000/day, Startup/Enterprise no limit); exceeding returns 429 with Retry-After header
agentmail.to ↗OpenAPI spec
https://agentmail.to/openapi.json
unevidenced