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Groundmail

Email API and SMTP relay that also gives AI agents their own mailboxes, with an MCP server for coding assistants.

Sources checked

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Pricing
Free plan with 3,000 emails a month (100 a day), never charged. Pay as you go is $15 a month with 20,000 emails included, then $0.70, $0.50 and $0.30 per 1,000 as volume grows. A dedicated mail server is $249 a month plus pay-as-you-go sending. Official source 1 ↗
Available as
Web dashboard, REST API, SMTP relay, a CLI and an MCP server, with official SDKs for Node/TypeScript, Python, Go, Rust, PHP and Ruby. Official source 1 ↗ · Official source 2 ↗ · Official source 3 ↗
Primary group
Automation & Agents

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What it does

Groundmail is email infrastructure for apps and AI agents. Apps send sign-in codes, receipts and alerts through its API or SMTP relay and get replies back, while AI agents get real mailboxes they can read and reply from. It also ships a CLI and an MCP server so coding assistants like Claude Code or Cursor can set it up.

Official source 1 ↗

Features

  • Agent mailboxes. Create a mailbox from the API, CLI or dashboard and an AI agent gets a real address it can read and reply from; a webhook can wake the agent when mail arrives, and you choose which senders get through. Official source 1 ↗
  • MCP server for coding assistants. Connect the Groundmail MCP server and assistants such as Claude Code, Cursor, GitHub Copilot or Zed can verify domains, send test emails and check delivery. Official source 1 ↗ · Official source 2 ↗
  • Agent-driven setup. A copy-paste prompt lets Claude Code, Cursor or Codex sign in through your browser, verify your domain and wire up sending, asking before it emails anyone else. Official source 1 ↗
  • Email API. One REST API with SDKs, batch sends of up to 100 emails, scheduled sends, idempotency keys and signed webhooks for every delivery event. Official source 1 ↗ · Official source 2 ↗
  • SMTP relay. Apps that only take an SMTP password, such as Supabase Auth, WordPress or Laravel, can point at smtp.groundmail.dev and send from their own domain. Official source 1 ↗
  • Inbound replies. Replies come back to your app as a webhook, linked to the email they answer. Official source 1 ↗
  • Test keys and simulator addresses. A gm_test_ key runs the whole pipeline and fires the same webhooks without delivering anything, and simulator addresses produce specific bounce and complaint outcomes. Official source 1 ↗

Pricing & free limits

Free

$0per month

3,000 emails a month, 100 a day, 3 sending domains, 3 agent mailboxes, 7 days of logs. Sending stops at the limit. Official source 1 ↗

Pay as you go

$15per month, plus usage

20,000 emails included, then $0.70/1,000 to 100K, $0.50/1,000 to 1M, $0.30/1,000 above. Tenants for up to 1,000 customers, 3 agent mailboxes then $1/month each, 90 days of logs, dedicated IP from 100,000 emails a month. Official source 1 ↗

Dedicated server

$249per month, plus pay-as-you-go sending

Your own mail server and IPs, built, warmed and managed by Groundmail; tenants for up to 10,000 customers and up to 1 year of logs. Official source 1 ↗

Billing details

Pay as you go is charged at the start of each billing period; usage above 20,000 emails is billed at the end, and received emails count the same as sent ones. Official source 1 ↗

Extra dedicated IPs cost $25 a month each, extra agent mailboxes $1 a month each, and an email testing add-on is $10 a month for 5,000 test emails. Official source 1 ↗

Free access & limits

Free stops sending at 3,000 emails a month (100 a day) and is never charged; no card is needed to sign up, but sending to anyone other than yourself requires a card on file. Official source 1 ↗

Best for & limitations

Give an AI agent its own email address so it can receive mail, be woken by a webhook and reply in the thread. Official source 1 ↗

Send an app's transactional email such as password resets, sign-in codes and receipts through the API or SMTP relay. Official source 1 ↗

Let a coding agent add email sending to an app built with tools like Lovable, Replit, Bolt or v0. Official source 1 ↗

  • Transactional mail only. Cold email and purchased or scraped lists are never allowed, newsletters need approval, and marketing campaigns are not available yet. Official source 1 ↗
  • Daily ramp for new accounts. On pay as you go, sending starts at 3,000 transactional emails a day and the limit doubles as you send cleanly. Official source 1 ↗
Groundmail product screenshot
Submitted screenshotFixed desktop viewport · 1440 × 900

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