AgentMail
AgentMail provides API-first email infrastructure purpose-built for AI agents, offering programmatic inboxes, email-verified agent identity, and event-driven webhooks for 500+ B2B customers across logistics, procurement, and finance.
- Company typePrivate
- Founded2025
- HeadquartersSan Francisco, United States
- Headcount11–50
- GTM typeB2B
- OfferingSoftware
What AgentMail does
AgentMail is an API-first email infrastructure platform purpose-built for AI agents, founded in August 2025 and headquartered in San Francisco. The platform provides programmatic inboxes that allow autonomous AI agents to send, receive, and process email as first-class actors, replacing human-mediated email clients with developer-facing APIs. Core products include an Inboxes API for creating dedicated email addresses per agent, an Onboarding API that uses email as an agent identity and verification channel, Realtime Webhooks that replace polling with event-driven delivery, official Python and TypeScript SDKs, and a Model Context Protocol (MCP) server for native integration with agent frameworks. Built-in NLP capabilities — semantic search and data extraction — are layered over inbound and outbound message content. The company claims Realtime Webhooks reduce per-inbox API calls from approximately 8,640 per day to a single event-driven call, a structural efficiency advantage for high-throughput agent workloads.
AgentMail serves 500+ B2B customers across logistics, procurement, and finance verticals, alongside 100,000+ agent users and tens of thousands of human developers. Its go-to-market is product-led and API-first, anchored on a free tier that has driven viral adoption — most visibly via the OpenClaw project in late January 2026, which spun up thousands of email-enabled agents and produced a 3x step-change in user growth — with an undisclosed Enterprise tier layered on top for production workloads. AgentMail participates in the Y Combinator Summer 2025 batch, received $500K from YC in September 2025, and closed a $6M seed on March 10, 2026 led by General Catalyst with participation from Y Combinator, Phosphor Capital, Paul Graham, and executives from HubSpot, Supabase, and Ramp. The company explicitly does not train machine learning models on customer email data, positioning itself as a neutral infrastructure provider rather than a data-flywheel business.
AgentMail firmographics
Firmographics- Name
- AgentMail
- Legal name
- AgentMail
- Website
- https://agentmail.to
- Company type
- Private
- Founded year
- 2025
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- AgentMail provides API-first email infrastructure purpose-built for AI agents, offering programmatic inboxes, email-verified agent identity, and event-driven webhooks for 500+ B2B customers across logistics, procurement, and finance.
- Ownership category
- akta.pro rank
AgentMail industry classification
Industry- Product category
- Email Infrastructure API
- SIC
- Services-Prepackaged Software (7372)
- akta.pro primary industry
- Agents & Autonomous Workflows (Tool Use, Planning, Multi-Agent) (HDAAACAF)
- akta.pro secondary industry
- Workplace Automation & Self-Service (RPA for IT, Chatbots, Virtual Agents) (BPAEAIAI)
Keywords
Where AgentMail is headquartered
LocationHeadquarters
- HQ city
- San Francisco
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
AgentMail business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Technology or R&D, Personnel, Marketing or Sales, Infrastructure, Operations
Revenue model
- API Platform Subscriptions / Usage: Revenue from API-based email inbox service for AI agents with tiered self-serve plans (free tier available, plus paid tiers implied by Enterprise menu and Pricing page). Hybrid model combining subscription baseline with usage-based pricing for inbox operations, messaging volume, and storage.
- Freemium Self-Serve Tier: Free tier ("Start for free", "No credit card required") to drive viral adoption and land-and-expand conversions to paid plans as agent volumes scale.
- Enterprise / B2B Contracts: B2B contracts with 500+ paying customers in logistics, procurement, and finance, funded with seed proceeds to expand engineering and platform.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Freemium | Pay-as-you-go | Free self-serve tier |
| Subscription | Annual | Enterprise plan |
Go-to-market motion3 records
Distribution channels3 records
Marketing channels5 records
AgentMail product offering
Product offeringCore offering
AgentMail is an email inbox API for AI agents that lets developers create, manage, and operate programmable email inboxes entirely over HTTP. It supports two-way conversational email with threads, replies, attachments, custom domains, real-time webhook delivery, semantic search, and data extraction, and is accessed via Python and TypeScript SDKs plus a Model Context Protocol (MCP) server.
Product overview
AgentMail offers a single unified API platform — branded simply as AgentMail — that gives AI agents their own email inboxes. The core surface is the Inboxes API, which lets developers (or the agents themselves, via the Onboarding API) create and operate inboxes programmatically. On top of that base, AgentMail packages a realtime Webhooks module for event-driven workflows, an MCP server plus Python and TypeScript SDKs for agent-framework integration, and built-in capabilities for threads, replies, attachments, custom domains, semantic search, and data extraction. In other words: one API product, the Inboxes API, with onboarding, webhooks, SDKs, and the MCP server as the named modules that compose the platform.
Differentiator
Problem solved
Functional benefit
Products and services
- AgentMail Email inbox API platform purpose-built for AI agents. Delivered via the AgentMail console (console.agentmail.to) and documentation (docs.agentmail.to), it provides the unifying surface under which developers (or agents themselves) create and operate email inboxes programmatically.
- AgentMail Onboarding API Self-service API endpoint that lets AI agents autonomously register and create their own email identities on AgentMail without developer involvement, supporting the use case of agents operating as independent internet users with persistent email-based identity.
Quantifiable outcome
- Reduces API calls from ~8,640 per day (10-second polling) to one call per actual event via webhook delivery
- +3 more outcomes
Companies that use AgentMail
Customer profileNamed customers1 record
Segments3 records
Ideal customer profiles2 records
AgentMail technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
AI capability7 records
Feature7 records
AgentMail partnerships and signals
Strategic signalScale indicators6 records
Recent moves6 records
Expansion highlights6 records
AgentMail competitors and assessment
Company assessmentEmerging players
- Plunk: Developer-first email API platform targeting modern SaaS and developer workflows. Emerging player with overlapping API-first positioning, though not specialized for autonomous AI agent identity or inbox provisioning.
- Knock: Notification infrastructure platform that abstracts multi-channel messaging (email, push, SMS) for product teams. Adjacent peer because it competes for the same developer mindshare around programmatic messaging workflows that AI agents require.
- Courier: Notification orchestration API that unifies email, push, SMS, and in-app messaging. Comparable on the developer-experience and infrastructure-for-software-agents axis, but does not specialize in agent-only inboxes or identity.
- Helicone: AI agent observability and infrastructure platform. Comparable as part of the broader "AI agent infrastructure" ecosystem, intersecting with AgentMail where agents need identity and communication primitives rather than monitoring.
Direct peers
- Resend: Developer-first email API platform for transactional and programmatic email sending. Closest direct peer because it competes head-on with AgentMail in the modern, API-first email infrastructure category, and is actively expanding into AI agent use cases.
Broad incumbents
- SendGrid (Twilio): Established cloud email API and transactional email service owned by Twilio. Broad incumbent that overlaps with AgentMail's email-sending core but is built for human-triggered transactional flows rather than agent-driven, high-volume autonomous workflows.
- Mailgun: Developer-focused email API service for sending, receiving, and tracking email at scale. Comparable transactional email infrastructure used by application developers, though not specialized for AI agent identity or autonomous onboarding.
- Postmark: Transactional email provider focused on fast, reliable delivery for application developers. Competes with AgentMail on the email-delivery substrate but lacks purpose-built agent identity and self-service onboarding primitives.
- Amazon SES: Cloud email sending and receiving service from AWS at massive scale and low price points. Broad incumbent alternative that any AI agent platform could choose, putting pricing pressure on AgentMail's usage tiers.
- Customer.io: Multi-channel messaging platform with strong email API capabilities and workflow automation. Broad incumbent that overlaps with AgentMail's automation and segmentation features for application-driven messaging at scale.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
AgentMail social profiles
Digital presenceAgentMail financial estimates
Financial estimateRevenue estimate
Valuation estimate
AgentMail leadership team
Management profileNumber of profiles
AgentMail funding detail
Funding detailFunding overview
Funding rounds2 records
Investors3 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
AgentMail M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about AgentMail
What does AgentMail do?
AgentMail is an email inbox API for AI agents that lets developers create, manage, and operate programmable email inboxes entirely over HTTP. It supports two-way conversational email with threads, replies, attachments, custom domains, real-time webhook delivery, semantic search, and data extraction, and is accessed via Python and TypeScript SDKs plus a Model Context Protocol (MCP) server.
Is AgentMail a public or private company?
AgentMail is a private company. It is classified as venture growth investor backed and is currently operating.
When was AgentMail founded?
AgentMail was founded in 2025. It employs 11 to 50 people.
Where is AgentMail based?
AgentMail is headquartered in San Francisco, United States, in the North America region.
How does AgentMail make money?
Three revenue lines are on record. API Platform Subscriptions / Usage is the primary driver. The others are freemium Self-Serve Tier and enterprise / B2B Contracts.
Who are AgentMail's main competitors?
Emerging players on record are Plunk, Knock, Courier and Helicone. Resend is listed as a direct peer. Broad incumbents are SendGrid (Twilio), Mailgun, Postmark, Amazon SES and Customer.io.
Does AgentMail have an API?
Yes. AgentMail offers a public REST API (the "Inboxes API") that allows developers to create, manage, and operate email inboxes for AI agents entirely via API. Capabilities include thread + reply handling, attachments, realtime events (webhooks), custom domains, semantic search, and data extraction. The platform supports SDKs in Python and TypeScript as well as cURL and a CLI. An onboarding API is offered for autonomous agent account creation without human involvement. Authentication and rate-limit details are not specified in the source. Developer documentation is at docs.agentmail.to.
What industry is AgentMail in?
AgentMail's product category is Email Infrastructure API. Its primary akta.pro industry code is HDAAACAF, Agents & Autonomous Workflows (Tool Use, Planning, Multi-Agent), with a secondary code of BPAEAIAI, Workplace Automation & Self-Service (RPA for IT, Chatbots, Virtual Agents). Its SIC code is 7372.