What is the key difference between Atomic Mail and SMTP)?

Atomic Mail belongs to the Communication category with local stdio execution, while SMTP) belongs to the Communication category with local stdio execution.

How do I install Atomic Mail or SMTP) in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are Atomic Mail and SMTP) free or paid?

Atomic Mail operates under a Free / Open Source model (No auth required). SMTP) operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

Atomic Mail lists 0 tools with 1 views and 264 GitHub stars. SMTP) lists 0 tools with 0 views and 2 GitHub stars.

Can I use both Atomic Mail and SMTP) together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

Side-by-Side Model Context Protocol Comparison

Atomic Mail vs SMTP)

In-depth architectural comparison of the Atomic Mail and SMTP) MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

At a Glance & Executive Verdict

Atomic Mail

Communication · Local stdio

Quality: 45/100 (Fair) | Auth: No auth required

SMTP)

Communication · Local stdio

Quality: 32/100 (Emerging) | Auth: No auth required

Verdict Summary: Choose Atomic Mail if you need specialized Communication tools running via a local process. Choose SMTP) if your workspace requires Communication integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Atomic Mail when:

You need dedicated capabilities in the Communication domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).

Explore Atomic Mail Details

Choose SMTP) when:

You need dedicated capabilities in the Communication domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).

Explore SMTP) Details

Feature & Specification Comparison

Specification	Atomic Mail Communication	SMTP) Email (IMAP Communication
Summary	Programmable email inbox for AI agents — JMAP, PoW auth, stdio MCP server.	Multi-account IMAP/SMTP email server with 22 tools for reading, sending, searching, and organizing.
Category & Scope	Communication	Communication

Tools & Capabilities Breakdown

Atomic Mail Tools (0)

No explicit tool names declared in metadata yet. Check project README on main listing page.

SMTP) Tools (0)

No explicit tool names declared in metadata yet. Check project README on main listing page.

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

Atomic Mail Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "atomic-mail": {
      "command": "npx",
      "args": [
        "-y",
        "--package"
      ]
    }
  }
}

SMTP) Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "email-imap-smtp": {
      "command": "npx",
      "args": [
        "-y",
        "email-imap-smtp"
      ]
    }
  }
}

Frequently Asked Questions

Atomic Mail is categorized under Communication and uses a local stdio subprocess. In contrast, SMTP) belongs to Communication using local stdio subprocess. Select Atomic Mail when you need capabilities focused on communication and SMTP) when you require tools for communication.

More alternatives to Atomic Mail More alternatives to SMTP)Communication category hub