MCP Email Server

MCP Email Server

A Model Context Protocol (MCP) server for email operations (POP3/SMTP with TLS). Allows an LLM like Claude to read, send, and manage emails.

Quick Start

Option 1: uvx (recommended)

No clone, no install — runs directly from GitHub:

uvx git+https://github.com/ptbsare/email-mcp-server \
  --email-user [email protected] \
  --email-pass yourpassword \
  --pop3-server pop.example.com \
  --smtp-server smtp.example.com

First run caches the package; subsequent launches are instant.

Option 2: Clone + run locally

git clone https://github.com/ptbsare/email-mcp-server
cd email-mcp-server
uv pip install -e .
uv run main.py --email-user [email protected] --email-pass yourpassword \
  --pop3-server pop.example.com --smtp-server smtp.example.com

Option 3: .env file

Create a .env file in the working directory:

[email protected]
EMAIL_PASS=yourpassword
POP3_SERVER=pop.example.com
SMTP_SERVER=smtp.example.com

Then simply:

uvx git+https://github.com/ptbsare/email-mcp-server
# or
uv run main.py

Configuration

Config Priority (highest → lowest)

1. CLI arguments — override everything
2. Environment variables — override .env file
3. .env file — fallback defaults

All Config Options

CLI Argument	Env Variable	Required	Default	Description
--email-user	EMAIL_USER	✅	—	Email address
--email-pass	EMAIL_PASS	✅	—	Email password / app password
--pop3-server	POP3_SERVER	✅	—	POP3 server hostname
--pop3-port	POP3_PORT		995	POP3 SSL port
--smtp-server	SMTP_SERVER	✅	—	SMTP server hostname
--smtp-port	SMTP_PORT		587	SMTP port (auto 465 if --smtp-use-ssl)
--smtp-use-ssl	SMTP_USE_SSL		false	Use SMTP_SSL (port 465) instead of STARTTLS
--log-level	LOG_LEVEL		INFO	Logging: DEBUG / INFO / WARNING / ERROR

Examples: Mixing Config Sources

# CLI args only (no .env needed):
uv run main.py --email-user [email protected] --email-pass xxx \
  --pop3-server pop.gmail.com --smtp-server smtp.gmail.com

# .env file for credentials, CLI for servers:
# .env: [email protected] / EMAIL_PASS=xxx
uv run main.py --pop3-server pop.gmail.com --smtp-server smtp.gmail.com

# Env vars override .env:
[email protected] uv run main.py --pop3-server pop.gmail.com ...

Using with Claude Desktop

Add to your Claude Desktop config file:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json Windows: %APPDATA%/Claude/claude_desktop_config.json

With env vars (in config):

{
  "mcpServers": {
    "email-mcp-server": {
      "command": "uvx",
      "args": ["git+https://github.com/ptbsare/email-mcp-server"],
      "env": {
        "EMAIL_USER": "[email protected]",
        "EMAIL_PASS": "your-app-password",
        "POP3_SERVER": "pop.example.com",
        "SMTP_SERVER": "smtp.example.com"
      }
    }
  }
}

With CLI args (in config):

{
  "mcpServers": {
    "email-mcp-server": {
      "command": "uvx",
      "args": [
        "git+https://github.com/ptbsare/email-mcp-server",
        "--email-user", "[email protected]",
        "--email-pass", "your-app-password",
        "--pop3-server", "pop.example.com",
        "--smtp-server", "smtp.example.com"
      ]
    }
  }
}

Tip: The env section and CLI args can be used together. CLI args always take priority.

Features

• Poll Emails: List inbox email headers with configurable limit (pollEmails)
• Fetch Full Emails: Get complete email content by ID, with automatic attachment extraction (getEmailsById)
• Delete Emails: Remove emails by ID (deleteEmailsById)
• Send Emails: Send plain text (sendTextEmail) or HTML (sendHtmlEmail) emails with optional file attachments
• Secure Connections: POP3 over SSL (port 995), SMTP with STARTTLS (port 587) or direct SSL (port 465)
• Attachment Support: Send local files as attachments; received attachments are auto-saved to /tmp/email_mcp_attachments/<email_id>/

Tools

pollEmails(limit=50)

List recent email headers (no body). Returns newest first. Use this first to get IDs for getEmailsById/deleteEmailsById.

Parameter	Type	Default	Description
limit	int	50	Max emails to return, newest first

Returns: [{"id": int, "Subject": str, "From": str, "Date": str, "Message-ID": str}]

pollEmails(limit=10)   # 10 most recent
pollEmails()           # default 50

---

getEmailsById(ids)

Fetch full email content (headers + body) by IDs from pollEmails. Attachments auto-saved to /tmp/email_mcp_attachments/<id>/.

Parameter	Type	Required	Description
ids	list[int]	✅	Email IDs from pollEmails(). Example: [1, 3, 5]

Returns: [{"id": int, "headers": dict, "body": str, "attachments": [{"filename": str, "local_path": str, "size": int, "content_type": str}]}]

getEmailsById(ids=[1, 3, 5])

---

deleteEmailsById(ids)

Permanently delete emails by IDs. Irreversible. Call pollEmails first.

Parameter	Type	Required	Description
ids	list[int]	✅	Email IDs from pollEmails(). Example: [1, 2, 3]

Returns: {"deleted": [int], "failed": {"id": "error msg"}}

deleteEmailsById(ids=[1, 2, 3])

---

sendTextEmail(toAddresses, subject, body, attachments=None)

Send a plain text email. Attachments: list of local file paths like ["/tmp/file.pdf"].

Parameter	Type	Required	Default	Description
toAddresses	list[str]	✅	—	Recipients. Example: ["[email protected]"]
subject	str	✅	—	Subject line
body	str	✅	—	Plain text body
attachments	list[str]		None	Local file paths. Example: ["/tmp/report.pdf"]

Returns: {"status": "success"}

sendTextEmail(
    toAddresses=["[email protected]"],
    subject="Hello",
    body="Hi Alice!",
    attachments=["/tmp/report.pdf"]
)

---

sendHtmlEmail(toAddresses, subject, body, attachments=None)

Send an HTML email. Attachments: list of local file paths like ["/tmp/file.png"].

Parameter	Type	Required	Default	Description
toAddresses	list[str]	✅	—	Recipients. Example: ["[email protected]"]
subject	str	✅	—	Subject line
body	str	✅	—	HTML content. Example: "<h1>Hi</h1><p>Hello!</p>"
attachments	list[str]		None	Local file paths. Example: ["/tmp/chart.png"]

Returns: {"status": "success"}

sendHtmlEmail(
    toAddresses=["[email protected]"],
    subject="Report",
    body="<h1>Report</h1><p>Sales up <b>20%</b>.</p>",
    attachments=["/tmp/chart.png"]
)

---

Development Setup

Prerequisites

• Python 3.12+
• uv

Steps

git clone https://github.com/ptbsare/email-mcp-server
cd email-mcp-server
uv pip install -e .
uv run main.py --help

Important Notes

• App Passwords: If your email provider uses 2FA, generate an App Password for EMAIL_PASS
• Email IDs: POP3 IDs are session-specific. Call pollEmails() before getEmailsById() or deleteEmailsById()
• Attachment Storage: Received attachments are saved to /tmp/email_mcp_attachments/<email_id>/
• Security: Never commit your .env file — it's already in .gitignore
• Config Priority: CLI args > environment variables > .env file

Project Structure

email-mcp-server/
├── main.py              # MCP server entry point (all logic)
├── pyproject.toml       # Package config & dependencies
├── uv.lock              # Dependency lock file
├── .env                 # Credentials (create your own)
├── .gitignore
└── README.md

License

MIT