Replyz

npx add-mcp 'https://mcp.replyz.io/mcp'

An email MCP server that gives your agent its own inbox.

Most email MCP servers connect your agent to your Gmail or Outlook. Replyz gives the agent an inbox of its own, so it can receive sign-up codes and confirmation links, without access to your personal mail. Use it only where a service's terms allow automated sign-ups.

How do you connect it?

Remote MCP endpoint, Streamable HTTP, authenticated with your API key:

https://mcp.replyz.io/mcp
Authorization: Bearer $REPLYZ_API_KEY

Claude Code

claude mcp add --transport http replyz https://mcp.replyz.io/mcp \
 --header "Authorization: Bearer $REPLYZ_API_KEY"

Or let the CLI set it up

npx -y @replyz/cli mcp install

Which tools does it have?

create_inbox, list_inboxes

Another address once the account allows it (sandbox: 1 live inbox, up to 3 once claiming opens (coming soon)).

wait_for_email

Waits up to 45 s for a matching email, by sender, subject or time, then returns it.

get_verification

Returns the code or link from the latest matching email, even if it arrived before the call.

list_messages, read_message

Read the inbox. Email content is always marked as untrusted.

email_my_human (coming soon)

The agent will write to you, its human, to report back. Not available yet.

account_status

Limits, usage and whether the account is claimed.

What does a session look like?

you Subscribe to the newsletter and tell me when it's confirmed.
agent list_inboxes → newsletter-quiet-finch-7c1e2k@youreplyz.com
agent get_verification(from: "*@news.example")
✓ link: https://news.example/confirm?t=…

Why not use a Gmail MCP server?

• Scope. A Gmail MCP server hands the agent your whole inbox. With Replyz it only sees mail sent to its own address.
• No Google OAuth app. Nothing to approve on your Google account, and nothing to revoke later.
• Built for agents. Waiting for an email and pulling out a code are single tool calls.
• EU data storage. Mail is stored at rest in the European Union. Requests are processed on Cloudflare's global network, which may be outside the EU.

Frequently asked questions

What is an email MCP server?

An MCP server that gives an AI agent email tools. Most connect the agent to your Gmail or Outlook. Replyz gives the agent an inbox of its own instead.

How do I connect the Replyz MCP server?

Point your MCP client at https://mcp.replyz.io/mcp over Streamable HTTP and send your API key as a Bearer token. The Replyz CLI can also do it for you with replyz mcp install.

Which tools does the Replyz MCP server have?

create_inbox, list_inboxes, list_messages, read_message, wait_for_email, get_verification and account_status. email_my_human is coming soon.

How long does wait_for_email wait?

Up to 45 seconds per call. If nothing arrives it returns a timeout and the agent simply calls it again.

Is email content safe to give to the model?

Every tool marks email content as untrusted, so the agent treats instructions inside an email as data, not as commands.

Should I use the MCP server or the CLI?

Use the CLI or the skill for agents that run on your machine (Claude Code, OpenClaw, Hermes): it is faster and keeps the API key out of the model's context. Use the MCP server for remote agents such as Cursor. Claude on the web, Desktop and Cowork need request headers, a beta for a limited set of organisations; OAuth is planned. ChatGPT needs OAuth, which Replyz plans to add.

My agent runs in a sandbox that only allows some domains. Will Replyz work?

Only after the owner allows api.replyz.io (and mcp.replyz.io). Agents in sandboxes that only allow listed domains, such as some cloud agents and code-execution environments, cannot reach Replyz until their human adds those domains to the allowlist.