Atomic Mail vs OpenMail
A side-by-side look at the Atomic Mail and OpenMail MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
O
OpenMailCommunicationGmail for agents: create inboxes, read and reply to mail, send email, manage domains. OAuth sign-in.36FairAuth: oauth 2.0Verdict: choose Atomic Mail for communication work as a local process; choose OpenMail for communication. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Atomic Mail when
- You need dedicated capabilities in the Communication domain.
- You prefer a local stdio subprocess transport.
OChoose OpenMail when
- You need dedicated capabilities in the Communication domain.
- Its auth model fits you: OAuth 2.0.
- You have the keys it needs:
OPENMAIL_API_URL, MCP_RESOURCE_URL, MCP_JWT_SECRET, CONSOLE_ORIGIN, PORT, POSTHOG_API_KEY, MCP_ANALYTICS_DEBUG.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | O OpenMail | |
|---|---|---|
| Category | Communication | Communication |
| Quality signal | 45/100 · Fair | 36/100 · Fair |
| Install command | Confirmed | Not confirmed yet |
| Transport | Local subprocess (stdio) | — |
| Auth | Not declared | OAuth 2.0 |
| Pricing | Not declared | Free |
| Required env vars | None listed | OPENMAIL_API_URLMCP_RESOURCE_URLMCP_JWT_SECRETCONSOLE_ORIGIN |
Tools & capabilities
Atomic Mail tools
No tool names declared yet. Check the project README from the listing page.
OpenMail tools
No tool names declared yet. Check the project README from the listing page.
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Atomic Mail
{
"mcpServers": {
"atomic-mail": {
"command": "npx",
"args": [
"-y",
"--package=@atomicmail/agent-skill-github",
"atomicmail"
]
}
}
}
OpenMail
No confirmed install command for OpenMail yet — follow the setup steps linked from its listing page rather than a guessed package name.
Frequently asked questions
Atomic Mail is categorized under Communication and uses a local stdio subprocess. OpenMail belongs to Communication and uses an install path we have not confirmed yet. Pick Atomic Mail for communication work and OpenMail for communication.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client. OpenMail has no confirmed install command yet — follow its own setup instructions.
Atomic Mail has no declared pricing — check the project's own site. OpenMail is listed as free. Auth: oauth 2.0. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add atomic-mail and openmail as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Atomic Mail has a quality signal of 45/100 (Fair) with 2 views, 0 installs and 266 GitHub stars. OpenMail has 36/100 (Fair) with 0 views, 0 installs and 0 GitHub stars.