Agent Identity
Identities for agents that send then block on replies: mailbox with threads, calls, A2A task trading, durable event log.
Free: 5 identities; Builder $19/mo
live · 200 · 122ms
AgentID
Create accounts for agents at third-party services using an AgentMail inbox as identity; track where each inbox is signed up.
See site
live · 200 · 458ms
AgentMail
Email inbox API built for AI agents: programmatic inboxes, threads, webhooks, IMAP/SMTP, custom domains, Python and TypeScript SDKs, MCP server.
Free: 3 inboxes / 3k emails; Developer $20/mo
live · 200 · 174ms
AgentMail Docs
Official AgentMail documentation: API, SDKs, MCP, pods, and inbox lifecycle.
n/a
live · 200 · 344ms
Amazon SES
Lowest per-message cost if you build inboxes yourself. Receipt rules to S3, SNS, or Lambda.
~$0.10/1k send+receive
live · 200 · 846ms
Botmail
Agent claims name@botmail.pro via CLI/MCP; human clicks one approval link. Threads, search, drafts, webhooks, wait_for_mail. No custom domains.
Free: 1 mailbox; Paid from $5/mo
live · 200 · 403ms
Botmail provider comparison
October 2026 side-by-side of 13 agent email providers with free tiers, MCP/CLI, and custom-domain notes (vendor-published; useful starting matrix).
n/a
live · 200 · 294ms
Brevo
Email API/SMTP platform often used as a sending layer under agent workflows.
Free + paid
live · 200 · 109ms
CarlyEmail
Inbox API shaped like AgentMail: create mailboxes from code, threaded replies, signed webhooks/WebSockets, per-tenant pods.
See site
live · 200 · 100ms
Cloudflare Email Routing
Free unlimited inbound routing on Cloudflare DNS. Pair with Email Workers / Agents SDK for agent handling; paid Workers for sending.
Free receiving; Workers Paid for send
live · 200 · 121ms
Cloudflare Email Workers
Run Worker code on inbound mail: parse, route, and trigger agent workflows at the edge.
Workers plan
live · 200 · 241ms
Courier
Multi-channel notification API with templates—useful when agents trigger user-facing messages.
Free + paid
live · 200 · 68ms
Customer.io
Behavioral email/messaging platform; agents can enqueue journeys rather than raw SMTP.
Paid
live · 200 · 115ms
Dead Simple Email
Email infrastructure for AI agents with API, IMAP/SMTP, webhooks, MCP. Agents can also buy an inbox pay-per-request with a wallet/card.
Free: 5 inboxes / 5k mo; Paid from $5/mo
live · 200 · 58ms
Email for Agents
Remote MCP inbox with an approval queue so a human can check mail before it goes out.
Free: 1 inbox / 100 units; ~$19 proposed
live · 200 · 342ms
Forward Email
Open-source email forwarding and privacy-focused routing for custom domains.
Free + paid; OSS
live · 200 · 772ms
Front
Customer communication hub (email/SMS/chat) with APIs—common human-in-the-loop layer for agent mail.
Paid
live · 200 · 154ms
Gmail API
Google's mail API for agents acting inside a user's Gmail/Workspace (not a dedicated agent inbox).
Free with Google account quotas
live · 200 · 714ms
Haraka
High-performance Node.js SMTP server with a plugin architecture.
Open source
live · 200 · 39ms
Help Scout
Help desk shared inbox; agents can draft, humans send—fits approval-gated outreach.
Paid
live · 200 · 158ms
ImprovMX
Simple email forwarding for custom domains. Lightweight way to catch agent signup mail.
Free forwarding + paid
live · 200 · 167ms
InboxAPI
Personal email address for AI agents via MCP-compatible CLI. Agent sends, receives, searches, replies, and forwards through tool calls.
Free (trial limits); paid TBD
live · 200 · 258ms
Inkbox
Agent identity with inbox, phone, SMS, and iMessage. IMAP/SMTP, public URL, A2A channel, MCP, multi-language SDKs.
Free: 3 identities; Developer $25/mo
live · 200 · 134ms
Knock
Notification infrastructure (email/push/in-app) for product-triggered agent alerts.
Free + paid
live · 200 · 92ms
Loops
Product email for startups (transactional + loops). Useful when an agent needs polished human-facing mail.
Free + paid
live · 200 · 233ms
Lumbox
Agent inbox plus OTP extraction, credential vault, and login automation for agents that must complete signups.
See site
live · 200 · 97ms
Maddy
Composable open-source mail server in Go. Lightweight self-host option for agent domains.
Open source
live · 200 · 319ms
Mailcow
Dockerized mailserver suite (SOGo, Rspamd, etc.) for self-hosted agent domains.
Open source
live · 200 · 267ms
Mailgun
Sending plus inbound routes matching recipient/headers. Good DIY base for agent reply handling.
Free limited; Basic from ~$15
live · 200 · 101ms
Mails.ai
Agent email with MCP and TypeScript/Python SDKs. Magic-link signup; first send creates the agent; custom domains on paid plans.
Free: 1 agent / 3k; Paid from $20/mo
live · 200 · 165ms
Mailtrap Agent Inbox
Email testing platform that also offers agent inbox + local MCP (npx mcp-mailtrap), webhooks, and custom domains.
Free tier + paid from $15/mo
live · 200 · 65ms
Mailtrap MCP guide
How to wire Mailtrap's local MCP into an agent stack.
n/a
live · 200 · 527ms
Microsoft Graph Mail
Official Graph API for Outlook/Exchange mailboxes when an agent acts on a human's Microsoft account.
Microsoft 365 licensing
live · 200 · 153ms
Missive
Shared team inbox with rules and assignments; sometimes used as the human escalation layer beside agents.
Paid team plans
live · 200 · 289ms
Novu
Open-source notification platform spanning email and other channels.
OSS + cloud
live · 200 · 241ms
Nylas
Nylas platform home (email, calendar, contacts APIs) behind Agent Accounts.
See Agent Accounts
live · 200 · 144ms
Nylas Agent Accounts
Hosted agent mailboxes from Nylas with CLI, MCP, SDKs, IMAP/SMTP, and calendar. Custom domains from $15/mo.
Free trial 3 accounts; Paid from $15/mo
live · 200 · 77ms
OneSignal
Push and messaging platform sometimes paired with agent workflows for alerts.
Free + paid
live · 200 · 52ms
OpenMail
Email API for AI agents with hosted MCP. Create inboxes, read, reply, and send from Claude Code or any MCP client.
Free: 3 inboxes; Pro from €9/mo
live · 200 · 321ms
Plain
API-first customer support platform useful when agent threads need a durable support system of record.
Paid
live · 200 · 256ms
Postal
Open-source mail delivery platform with HTTP APIs and webhooks for sending at scale.
Open source
live · 200 · 711ms
Postmark
Deliverability-first transactional email with inbound parse to JSON webhooks. Strong for agents that mostly send.
Free 100/mo; Pro from ~$15
live · 200 · 80ms
Proton Mail Bridge
Local Bridge exposing Proton Mail over IMAP/SMTP for desktop agents with a Proton account.
Proton paid plans
live · 200 · 534ms
Reloop
Open-source agent inbox platform plus transactional mail and campaigns. Self-host or use hosted; IMAP-capable.
OSS self-host; hosted plans available
live · 200 · 644ms
Resend Inboxes
Transactional email platform adding agent inboxes with threads. Domain required; MCP and skills support.
Inboxes in private beta; sending free/Pro tiers
live · 200 · 147ms
Robotomail
Agent follows robotomail.com/skill to claim a mailbox; owner verifies email. MCP, CLI, multiple SDKs; custom domains on paid plans.
Free limited; Paid from $19/mo
live · 200 · 475ms
SendGrid Inbound Parse
Official docs for parsing inbound email into multipart POST webhooks your agent can consume.
Included with SendGrid
live · 200 · 55ms
Stalwart
Modern all-in-one mail server (JMAP/IMAP/SMTP) you can self-host as agent infrastructure.
Open source
live · 200 · 139ms
Twilio SendGrid
Transactional/marketing email with Inbound Parse webhook for routing agent replies.
Free tier + paid
live · 200 · 301ms
WildDuck
Scalable open-source email server focused on IMAP and modern APIs.
Open source
live · 200 · 227ms