MailFlat — MCP server
Native Model Context Protocol server for
MailFlat. Gives Claude Desktop, Cursor, or any MCP client
disposable inbox tooling — create inboxes, wait for OTP codes, send DKIM-signed mail,
and clean up. Built on the mailflat Python SDK.
Run
# zero-install, isolated (recommended)
MAILFLAT_API_KEY=mf_live_… uvx mailflat-mcp
# or install it
pipx install mailflat-mcp
MAILFLAT_API_KEY=mf_live_… mailflat-mcp
Claude Desktop / Cursor config
Add to claude_desktop_config.json (or your client's MCP config):
{
"mcpServers": {
"mailflat": {
"command": "uvx",
"args": ["mailflat-mcp"],
"env": { "MAILFLAT_API_KEY": "mf_live_..." }
}
}
}
Get your API key from the MailFlat dashboard → Agents.
Tools (11)
| Tool | What it does |
|---|---|
create_inbox(prefix?, label?, retention_hours?) |
Open a disposable inbox; retention_hours capped by your plan |
list_inboxes() |
All inboxes this key can see |
read_messages(address, direction="in") |
Read messages; received mail by default (out / all for the rest) |
wait_for_otp(address, timeout=30) |
Poll until an OTP arrives, then return it |
wait_for_message(address, timeout=30) |
Poll until a new message arrives; ignores mail you sent |
send_email(address, to, subject?, body?, html?) |
Send a DKIM-signed mail from the inbox |
reply(address, message_id, body?, html?) |
Answer a message in the same conversation (threading headers filled in) |
mark_read(address, message_id) |
Mark one message read so later polls skip it |
burn_inbox(address) |
Delete every message but KEEP the address |
delete_inbox(address) |
Delete the inbox and its messages |
delete_message(address, message_id) |
Delete one message; the inbox itself stays |
Reads return received mail by default. Without that, sending to a peer and then waiting for the reply would immediately match your own outgoing message.
Configuration
MAILFLAT_API_KEY— your account API key (required).MAILFLAT_API_URL— override the API base (defaulthttps://mailflat.net; for self-hosted / BYOD).
License
MIT
1 maintainer
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