Best MCP servers for email
14 working options, checked Nov 8, 2026.
Short answer: the top picks for email right now are Cooper Email, Resend and Postfleet. We list 14 options here: 4 work without sign-in, 6 need a sign-in and 4 run on your own machine.
An email MCP server lets an AI assistant read, search, draft or send email. They fall into three groups: inboxes made for agents, connections to your existing mailbox, and tools that check an address before you send to it.
Top picks
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Cooper Email
Email inboxes for AI agents: one request creates an inbox and API key, with REST, signed webhooks and a hosted MCP server.
Tools include
cooper_onboard,cooper_create_inbox,cooper_create_inboxes,cooper_list_inboxes,cooper_send_message -
Resend
Send transactional email from your agent via Resend.
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Postfleet
Give your AI agent an inbox: send, receive and reply to email over MCP or REST.
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Busymail
An IMAP email client with an MCP server. Your agent reads, searches and drafts; nothing sends until you approve it.
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Mailyond
One email inbox for all your domains, plus a send API for your app. Read and reply as any domain from any MCP client.
All 14 compared
| Server | What it does | Setup | Tools |
|---|---|---|---|
| Cooper Email | Email inboxes for AI agents: one request creates an inbox and API key, with REST, signed webhooks and a hosted MCP server. | Hosted, no sign-in | 107 |
| Resend | Send transactional email from your agent via Resend. | Runs locally | – |
| Postfleet | Give your AI agent an inbox: send, receive and reply to email over MCP or REST. | Hosted, sign-in | – |
| Busymail | An IMAP email client with an MCP server. Your agent reads, searches and drafts; nothing sends until you approve it. | Hosted, sign-in | – |
| Mailyond | One email inbox for all your domains, plus a send API for your app. Read and reply as any domain from any MCP client. | Hosted, sign-in | – |
| Fortmail | Agent-operated email in one Cloudflare Worker (MIT) | Runs locally | – |
| mails0 | Open-source email infrastructure for AI agents — inboxes, OTP, search, MCP, Cloudflare self-host. | Runs locally | – |
| anon.li | Remote MCP server whose tools manage anon.li email aliases, recipients, encrypted drops and forms. | Hosted, sign-in | – |
| Verifly Email Verification | Verify emails from any MCP client — single, batch, or bulk — with pay-as-you-go credits and agent self-registration. | Hosted, no sign-in | 17 |
| MailVeri MCP | MCP server for MailVeri email verification: verify single emails or bulk lists, check balance, and download results from Claude, Cursor and other MCP clients. | Runs locally | – |
| ContactLint | Validate emails and phone numbers before your agent saves them. | Hosted, no sign-in | 3 |
| B2B Email & Domain Scorer | Score lead emails: business vs free/role/disposable, typo fixes, MX and SPF/DMARC. | Hosted, no sign-in | 2 |
| OutreachBox | Agentic marketing automation: research prospects, run email campaigns and triage replies from any MCP client. | Hosted, sign-in | – |
| Brevo | Coordinate customer journeys across channels | Hosted, sign-in | – |
How to choose
- Your mailbox or a new one? To work through your own email, connect your mailbox. For an agent that signs up for things or handles replies, give it its own inbox.
- Require approval before sending. The safest servers let the assistant draft while a person presses send.
- Sending at volume? For product or transactional email, use a server backed by a real sending service so messages reach the inbox.
How to connect one
Here is Cooper Email as an example. In Claude Code, run:
claude mcp add --transport http cooper-email https://cooperemail.com/mcpFor other apps, follow our guides for Claude, ChatGPT, Cursor and VS Code.
How we picked these
We read each listing's tools and put the closest fit for this job first. Hosted servers must pass a real MCP handshake in our daily check to stay on this page, and local servers are reviewed from their source or package. That shows a server responds, not how well it works for you, and we don't run every tool in production.
Frequently asked questions
Which of these MCP servers work without signing in?
Cooper Email, Verifly Email Verification, ContactLint and B2B Email & Domain Scorer answered our latest live check with no account or key.
Can an AI assistant send email through MCP?
Yes, if the server exposes a send tool. Some servers can only draft on purpose, leaving the final send to you. Check the tool list on the listing before connecting one.
Is it safe to connect my inbox to an AI assistant?
Be careful. Email often contains private data, and a message can include hidden instructions aimed at the assistant. Prefer read-only or draft-only access and require approval to send.
How often is this list updated?
Every hosted server here is re-checked daily with a real MCP handshake, and a server drops off this page while it fails that check. Last check: Nov 8, 2026.