AgentMail
AgentMail provides API-first email inboxes for AI agents to send, receive, and manage emails, with threads, attachments, and real-time events. Built for scale.
Editor's Verdict
Key Takeaways
- Inboxes API
- Threads + Replies
- Attachments
- Realtime Events
In-Depth Review: What is AgentMail?
AgentMail is the email inbox API specifically designed for AI agents. It enables agents to have their own inboxes, manage two-way conversations, handle attachments, and receive real-time events. Unlike traditional email APIs for notifications, AgentMail is built for conversational agents, with support for threads, custom domains, and semantic search. Used by companies like Flowtel, casemark, and backed by Y Combinator.
Core Features
Inboxes API
Create, manage, and operate email inboxes entirely via API. Provides threads, replies, attachments, realtime events, custom domains, SDKs, MCP, semantic search, and data extraction.
Threads + Replies
Supports stateful two-way conversations with thread management, allowing AI agents to read, understand, and reply within context.
Attachments
Full support for sending and receiving email attachments including PDFs, images, and documents with size limits detailed in API docs.
Realtime Events
Webhooks and websockets for real-time notifications when emails arrive, enabling immediate agent responses.
Custom Domains
Use your own domain for improved deliverability and branding. Supports DKIM, SPF, DMARC authentication.
SDKs + MCP
Typed SDKs for Python, TypeScript, cURL, CLI, and MCP Server for easy integration and Agent-to-Agent communication.
Enterprise-Grade Reliability
Built on redundant infrastructure across multiple regions ensuring 100% uptime and no missed messages.
Instant Inboxes
Spin up a new inbox in milliseconds with one API call. No domain verification or waiting required.
Semantic Search
Ability to search through emails semantically, not just by keywords, for efficient information retrieval by agents.
Data Extraction
Automatically parse invoices, receipts, and attachments to extract structured data for downstream processing.
Pricing
FREE
- 3 inboxes
- 3,000 emails/month
- 100 emails/day
- 3 GB storage
- Threads
- Labels
- Attachments
- Drafts
- Schedule Send
- SDKs
- MCP Server
- Inbox Pods: 3
- Webhook Endpoints: 2
- Websockets
- Metrics
- SMTP Relay
- Discord Community
- Email support
DEVELOPER
- 10 inboxes
- 10,000 emails/month
- 1,000 emails/day
- 10 GB storage
- Threads
- Labels
- Attachments
- Drafts
- Schedule Send
- SDKs
- MCP Server
- Inbox Pods: 10
- Webhook Endpoints: 2
- Websockets
- Metrics
- SMTP Relay
- Custom Domains: 10
- DKIM, SPF, DMARC
- Suppression List
- Optimized Shared IPs
- Team Members: 2
- Social SSO
- Multi-factor Auth
- Signed Webhooks
- Discord Community
- Email support
STARTUP
- 150 inboxes
- 150,000 emails/month
- No daily limit
- 150 GB storage
- Threads
- Labels
- Attachments
- Drafts
- Schedule Send
- SDKs
- MCP Server
- Inbox Pods: 150
- Webhook Endpoints: 10
- Websockets
- Metrics
- SMTP Relay
- Custom Domains: 150
- DKIM, SPF, DMARC
- Suppression List
- Optimized Shared IPs
- Team Members: 10
- Social SSO
- Multi-factor Auth
- Signed Webhooks
- SOC 2 Report
- Slack Channel support
ENTERPRISE
- Everything in Startup tier
- Unlimited inboxes available
- Bulk discounts
- White-label platform
- Usage-based pricing
- EU region cloud
- BYO cloud deployment
- Dedicated IPs
- OIDC/SAML SSO
- Custom support
Pros and Cons
Pros
- Easy to set upOne API call to create an inbox, no domain verification needed. Start in minutes.
- Reliable and scalableBuilt on redundant infrastructure with enterprise-grade reliability. Handles millions of emails.
- Developer-friendlySimple RESTful API with typed SDKs (Python, TypeScript, cURL, CLI) and MCP support. Great documentation.
- Good deliverabilityProper email headers, threading, SPF/DKIM/DMARC support ensures emails land in inboxes, not spam.
- Two-way conversationalBuilt for AI agents to have stateful conversations, unlike traditional transactional email APIs.
Cons
- Not integrated with GmailAgentMail is a separate provider, not a Gmail add-on. If you need Gmail integration, this may not suffice.
- Free tier limitationsFree plan has only 3 inboxes, 3,000 emails/month, and 100 emails/day, which may be restrictive for testing larger scenarios.
- Limited support on lower tiersFree and Developer plans include only email and Discord support; no dedicated support or SLAs.
- Steep learning curve for email deliverabilityWhile they provide docs, managing deliverability (warm-up, content guidelines) can be complex for newcomers.
- No built-in agent orchestrationAgentMail provides the email layer but doesn't include agent logic or orchestration; you must build your own agent framework.
Use Cases & Recommended Professions
AI Agent Developer→ View Toolkit
Build and deploy AI agents that need to communicate via email for tasks like scheduling, customer support, or automation.
Browser Automation Engineer→ View Toolkit
Create browser agents that sign up for services by extracting OTP codes from email. AgentMail provides the inbox to receive these codes.
Customer Service Automation Specialist→ View Toolkit
Ingest support emails into an AI agent that can read, understand, and reply to customer inquiries automatically.
Document Processing Developer→ View Toolkit
Parse invoices, receipts, and attachments from email automatically using AgentMail's attachment handling and data extraction.
Scheduling / Executive Assistant AI Builder→ View Toolkit
Develop AI that manages calendars, schedules meetings, and sends summaries by leveraging AgentMail's inbox and thread capabilities.
Email Automation Engineer→ View Toolkit
Replace traditional email APIs with AgentMail for building conversational email workflows in applications.
Frequently Asked Questions
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ℹ️ Curation Disclosure: The overview and features of AgentMail were synthesized using AI and fact-checked by our curation team to ensure accuracy.
