e2a

e2a.dev · checked 8 Oct 2026

#18 · Email APIs

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How it plugs in

—Public API

NoOpen source

YesFree tier

Signal on Email APIs5.9#18 of 31

e2a is an open-source email API for applications and AI agents, available as hosted service or self-hosted Apache-2.0 software.

Pricing

Inbox add-on+1 inbox · +3,000 sends/month · removes Free daily send cap$2/mo
Starter10 agents · 5 custom domains · 20,000 sends/month · 5 GiB storage · SPF/DKIM verification · approval workflow · webhook and WebSocket delivery · email support$10/mo
Pro25 agents · 10 custom domains · 50,000 sends/month · 10 GiB storage · approval workflow · webhook and WebSocket delivery · email support$20/mo
Scale250 agents · 150 custom domains · 200,000 sends/month · 100 GiB storage · Pro features · priority support$99/mo
Free3 agents · 3 custom domains · 3,000 sends/month · 20 sends/day · 1 GiB storage · SPF/DKIM verification · WebSocket delivery · e2a footerOn request

As e2a.dev lists them, checked 8 Oct 2026.

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Runs on

Web
Windows
Mac
Linux
iOS
Android

Facts

Website: e2a.dev
Price: Free tier · from $10/mo
Free trial: Not stated
Agent inboxes: Agents can have dedicated two-way email addresses on the shared agents.e2a.dev domain or a verified custom domain.
Delivery options: Inbound mail can reach agents through MCP, signed webhooks, WebSocket, REST polling, or the TypeScript and Python SDKs.
Email authentication: e2a evaluates SPF, DKIM, and DMARC on inbound messages and provides the results as structured evidence.
Human approval: An optional per-agent approval gate can hold outbound messages for review, with configurable expiry behavior.
Integrations: The maker documents MCP access and TypeScript and Python SDKs, and says outbound mail can use Amazon SES or Resend as an upstream relay.
Pricing limits: Only outbound mail counts toward allowances, each recipient counts as one send, and inbound mail is free and unmetered.
Privacy: The privacy page says e2a stores message headers, bodies, and attachments and does not train models on mail.
Security screening: Optional inbound screening can flag prompt-injection payloads and route messages to allow, review, or block.
Self-hosting: The maker says e2a can be self-hosted with a customer-managed Postgres database and outbound mail relay at no license cost.
Shared-domain sending: Sending to other recipients from the shared e2a domain requires a one-time approval request; paid tiers do not waive this review.
Supported MCP clients: The MCP page says e2a is tested with Claude Code, OpenAI Codex, Cursor, Windsurf, Claude Desktop, and VS Code with GitHub Copilot.
Transactional email: Applications can send transactional email through the HTTP API or TypeScript and Python SDKs without an agent framework.

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