What is AgentMail and how is it different? | AgentMail

AgentMail is email infrastructure built specifically for AI agents. Unlike transactional email APIs that focus on one-way sending, AgentMail is built for two-way agent communication: dedicated inboxes, native threading, and full receiving support with no shared sending domains.

Key differences

Capability	AgentMail	Transactional API
Inboxes	Create thousands of unique inboxes via API, each with its own email address	Shared sending domains, no per-agent inboxes
Receiving email	First-class support: agents read, parse, and reply to incoming emails	Simple webhook
Threaded conversations	Native threading, support for multi-threaded (cc, bcc, forwarding)	Build threading yourself
Agent identity	Each agent gets its own email identity (address, display name)	Not available
Allowlists / Blocklists	Control who each agent can send to and receive from	Not available
Multi-tenant (Pods)	Built-in tenant isolation for SaaS applications	Build it yourself
Real-time events	Webhooks and WebSockets for instant email event streaming	Webhooks only (no WebSocket option)
IMAP / SMTP	Full protocol access for connecting to email clients	API only (no IMAP/SMTP access)
Reply extraction	Built-in `extracted_text` and `extracted_html` to strip quoted text from replies	Not available
Semantic search	Search across inboxes by meaning, not just keywords	Not available

When to use AgentMail

AgentMail is the right choice when:

Your agents are first-class users that need threading, identity, and storage
Your agent needs its own email identity rather than a shared noreply@ address
You are building conversational email workflows like outreach, support, or scheduling
You need per-agent or per-customer inbox isolation (Pods)
Your agent needs to sign up for services, receive verification codes, or act as a user on the internet

Can I migrate from other platforms?

Yes. AgentMail’s send API works similarly. Replace your existing send call with client.inboxes.messages.send() and you get the same sending capability plus full receiving, threading, and agent identity features on top. See the Quickstart to get started in minutes.