emperor-mail MCP Server
Email over IMAP and SMTP: search and read messages and attachments; draft and send when switched on
emperor-mail scores 37 (Limited), licensed Apache-2.0 and written in Rust. It installs as a local process. It does not declare tools yet. Filed under Communication. GitHub shows 0 stars. Install configs are generated for 10 clients. Being listed in the registry is not the same as being vendor-official.
Limited trust
37 of 100 from six public signals. Nobody can buy a point.
- OSI-style license: apache-2.0.
License, quality and maintenance
Where the 37 comes from
0 + 20 + 0 + 10 + 4 + 3 = 37. Each factor is capped, so no single signal can carry a listing.
Active in the official MCP registry, plus a known vendor namespace.
Registry: 0 of 30 points.How recently the repository saw a commit or release.
Maintenance: 20 of 20 points.GitHub stars and weekly downloads, on a log scale.
Popularity: 0 of 20 points.A clear, OSI-style open-source license.
License: 10 of 10 points.Not archived, a secure install path, a pinned version.
Security: 4 of 10 points.A real summary, a README with depth, listed tools.
Docs: 3 of 10 points.Install
Pick your client, copy the config, paste it in.
Needs Cursor or VS Code installed on this device. The button opens the app and asks you to confirm before it adds the server.
{ "mcpServers": { "yarenty-emperor-mail": { "command": "npx", "args": [ "-y", "emperor-mail@0.1.3" ], "env": { "MAIL_USER": "", "MAIL_PASSWORD": "YOUR_MAIL_PASSWORD", "MAIL_OAUTH_TOKEN": "YOUR_MAIL_OAUTH_TOKEN", "MAIL_FROM": "", "IMAP_HOST": "", "IMAP_PORT": "", "IMAP_SECURITY": "", "SMTP_HOST": "", "SMTP_PORT": "", "SMTP_SECURITY": "", "MAIL_WRITABLE": "false", "MAIL_ALLOW_SEND": "false", "MAIL_SEND_ALLOW": "", "MAIL_FROM_ALLOW": "" } } }}
Environment variables
| Name | Required | Notes |
|---|---|---|
MAIL_USER | Required | Login name for IMAP and SMTP |
MAIL_PASSWORDSecret | Optional | Password or app password (set this or MAIL_OAUTH_TOKEN) |
MAIL_OAUTH_TOKENSecret | Optional | OAuth 2.0 access token for XOAUTH2, instead of a password (Gmail, Microsoft 365) |
MAIL_FROM | Optional | From address when the login name is not an address (default: the login name) |
IMAP_HOST | Required | IMAP server host name |
IMAP_PORT | Optional | IMAP port (default 993, or 143 with starttls) |
IMAP_SECURITY | Optional | IMAP connection security; plain only for a loopback host (default tls, starttls on port 143) |
SMTP_HOST | Optional | SMTP server host name, needed only for send |
SMTP_PORT | Optional | SMTP port (default 465, or 587 with starttls) |
SMTP_SECURITY | Optional | SMTP connection security; plain only for a loopback host (default tls, starttls on ports 587 and 25) |
MAIL_WRITABLE | Optional | true offers the draft tool; unset, empty, false, 0, no or off keep the server read-only |
MAIL_ALLOW_SEND | Optional | true offers the send tool and draft; unset, empty, false, 0, no or off keep send out of the tool list |
MAIL_SEND_ALLOW | Optional | Comma-separated recipients send may write to: addresses (ann@example.org) or domains (@example.org). With sending on and none set, every recipient is refused |
MAIL_FROM_ALLOW | Optional | Comma-separated From addresses send and draft may use: addresses or domains (@example.org). Unset: any |
Tools
All capabilitiesTools show up when the registry metadata or the repository README lists them. Public READMEs are read directly. A GitHub token is used only when one is already configured.
About
Email over IMAP and SMTP: search and read messages and attachments; draft and send when switched on
Frequently asked questions
What is emperor-mail MCP Server?
Email over IMAP and SMTP: search and read messages and attachments; draft and send when switched on
How do I install emperor-mail MCP Server in Claude Desktop, Cursor, or VS Code?
Pick your client in the Install section on this page and copy the generated config into the client's config file. Step-by-step guides: Claude Desktop, Cursor, and VS Code. emperor-mail MCP Server runs locally from the package emperor-mail with the command npx -y emperor-mail@0.1.3.
Is emperor-mail MCP Server free and open source?
Yes. emperor-mail MCP Server is released under the Apache-2.0 license, an OSI-approved open-source license, so you can use, modify, and self-host it under those terms.
Does emperor-mail MCP Server support remote (HTTP) connections?
No remote endpoint is listed for emperor-mail MCP Server. It runs locally on your machine over stdio, started by your MCP client.
How is emperor-mail MCP Server's trust score calculated?
emperor-mail MCP Server scores 37 out of 100 (Limited). The score adds six capped public signals: registry status, maintenance, popularity, license, documentation, and security. Nobody can pay for points. Read the methodology for the full formula.
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