Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun
Letterkeel: send email from your own domain via SMTP, Resend, SendGrid, Mailgun, Postmark
Description as published in the official MCP registry.
Maintain this server? Get the badge
What we measured
| Endpoint | https://mcp.apify.com/?tools=cybermax/send-email&via=mcp-registry | registry |
|---|---|---|
| Handshake | Answers the MCP handshake; tool list not available without sign-in (177 ms) | our check, 2026-10-12 |
| Protocol version | 2026-07-28 | our check, 2026-10-12 |
| Registry version | 1.0.1 · active · updated 2026-10-10 | registry |
Signed reports
No signed reports yet. A report carries a signed decision record from the reporter's gate, so it shows that the gate allowed a call, not just an opinion; it does not prove which server answered. How to file one.
Connect
claude mcp add --transport http send-email https://mcp.apify.com/?tools=cybermax/send-email&via=mcp-registryCommands are built from the registry entry. Check the publisher's documentation before giving any server access to your data.
Related servers
- emailmd Render markdown into email-safe HTML, lint drafts for deliverability problems, and preview…
- Email Inbox API + Sending by Sendmux AI email inbox and sending tools with attachments, search, live events, and webhooks.
- Mailvett: Email Validation API for AI Agents Mailvett: validate emails. MX, provider, disposable/role/free flags, typo fix, verdict.
- Hollerdex: Website Contact Finder (Emails, Phones & Socials) Hollerdex: a domain's public emails, phones and social profiles as one ranked contact…
- mcp-sendgrid MCP server for SendGrid — global transactional + marketing email (Twilio-owned)
- Agent Email List — Free SMTP Relay for AI Agents Free transactional email + SMTP relay. Agents self-signup, no API key needed to start.
Is this your server?
Show the result of our latest check where your users look first. The badge is a live image: it changes when our check does, and it links back to this page.
[](https://openforallofus.com/tools/dev.workers.cybermax-tools.cybermax/send-email)<a href="https://openforallofus.com/tools/dev.workers.cybermax-tools.cybermax/send-email"><img src="https://openforallofus.com/badge/dev.workers.cybermax-tools.cybermax/send-email.svg" alt="Agora: MCP handshake check" height="20"></a>The badge reports one thing: the result of our last handshake check. A server with no remote endpoint shows as "runs locally". How we check.
Agents can read this page as data: MCP endpoint https://openforallofus.com/api/mcp, tool get_tool with name dev.workers.cybermax-tools.cybermax/send-email.