mcp-email-client 0.1.3

A Model Context Protocol (MCP) server for sending and receiving emails, supporting IMAP/SMTP, with display name, reply, and robust error handling.

MCP Email Client

A Model Context Protocol (MCP) server for sending and receiving emails, supporting IMAP/SMTP, with display name, reply, and robust error handling.

Features

• Send emails (with display name support)
• List inbox emails (brief info)
• Read email details by UID
• Reply to emails (auto set headers, display name)
• Environment variable based configuration
• Robust error handling and IMAP/SMTP compatibility

Example JSON config for MCP/Claude/Inspector

This format is suitable for use with Claude Desktop, MCP Inspector, or any MCP client that supports multi-server JSON configuration:

{
  "mcpServers": {
    "mcp-email-client": {
      "command": "uvx",
      "args": [
        "mcp-email-client"
      ],
      "env": {
        "MAIL_USER_NAME": "[e-mail]",
        "MAIL_PASS_WORD": "yourpassword",
        "MAIL_SMTP_ADDR": "smtp.example.com:465",
        "MAIL_IMAP_ADDR": "imap.example.com:993",
        "MAIL_FROM_NAME": "Your Name",
        "MAIL_FROM_ADDR": "[e-mail]"
      }
    }
  }
}

• You can add multiple servers under mcpServers.
• This config can be loaded directly by Claude Desktop, MCP Inspector, or compatible tools.

Environment Variables

Name	Description	Example
MAIL_USER_NAME	Email account (login username)	[e-mail]
MAIL_PASS_WORD	Email account password/app token	yourpassword
MAIL_SMTP_ADDR	SMTP host:port	smtp.example.com:465
MAIL_IMAP_ADDR	IMAP host:port	imap.example.com:993
MAIL_FROM_ADDR	(Optional) From email address	[e-mail]
MAIL_FROM_NAME	(Optional) From display name	Alice

Installation

uv pip install fastmcp
# or
pip install fastmcp

Usage

1. Set environment variables (see above)
2. Run the server:

python server.py

API Endpoints (Tools)

send_email

Send an email.

• Args:
  • to: Recipient email address
  • subject: Email subject
  • content: Email body (plain text)
• Returns: { "success": bool, "message": str }

list_emails

List inbox emails (brief info).

• Args:
  • limit: Maximum number of emails to return (default 10)
• Returns: { "emails": [ { "uid", "subject", "snippet", "date", "seen" } ] }

read_email

Read full details of an email by UID.

• Args:
  • uid: UID of the email
• Returns: { "uid", "message_id", "from", "to", "subject", "date", "seen", "in_reply_to", "references", "snippet" }

reply_email

Reply to an email (auto set headers, display name, auto-detect html).

• Args:
  • uid: UID of the original email to reply to
  • subject: Email subject
  • content: Email body (plain text or HTML)
• Returns: { "success": bool, "message": str }

Example .env

MAIL_USER_NAME=[e-mail]
MAIL_PASS_WORD=yourpassword
MAIL_SMTP_ADDR=smtp.example.com:465
MAIL_IMAP_ADDR=imap.example.com:993
MAIL_FROM_NAME=Your Name
MAIL_FROM_ADDR=[e-mail]

FAQ

• Q: Why do I get 'Email content is empty'?
  • A: The UID may not exist, or the email was deleted/moved. Make sure to use a valid UID from list_emails.
• Q: How to set display name?
  • A: Set MAIL_FROM_NAME in your environment variables.
• Q: How to send HTML email?
  • A: Just include HTML tags in content, the server will auto-detect and set the correct MIME type.

License

MIT