Unosend Server

Send emails from AI assistants using the Unosend API. Works with Claude Desktop, Cursor, and other MCP clients.

Features

• ✉️ Send plain text and HTML emails
• 📅 Schedule emails for future delivery
• 👥 Add CC and BCC recipients
• ↩️ Configure reply-to addresses
• 🔒 Customizable sender email (requires verified domain)

Installation

# Clone and build
git clone https://github.com/unosend/mcp-server.git
cd mcp-server
npm install
npm run build

Setup

1. Get your API Key

1. Go to Unosend Dashboard
2. Create a new API key
3. Copy the key (starts with un_)

2. Verify your domain

To send emails from your own domain, verify it first.

Configuration

Cursor

Open Cursor Settings → MCP → Add new global MCP server:

{
  "mcpServers": {
    "unosend": {
      "type": "command",
      "command": "node /path/to/unosend-mcp/build/index.js --key=un_YOUR_API_KEY [email protected]"
    }
  }
}

Claude Desktop

Open Claude Desktop settings → Developer → Edit Config:

{
  "mcpServers": {
    "unosend": {
      "command": "node",
      "args": ["/path/to/unosend-mcp/build/index.js"],
      "env": {
        "UNOSEND_API_KEY": "un_YOUR_API_KEY",
        "SENDER_EMAIL_ADDRESS": "[email protected]",
        "REPLY_TO_EMAIL_ADDRESS": "[email protected]"
      }
    }
  }
}

Arguments

Argument	Environment Variable	Description
--key	UNOSEND_API_KEY	Your Unosend API key (required)
--sender	SENDER_EMAIL_ADDRESS	Default sender email (optional)
--reply-to	REPLY_TO_EMAIL_ADDRESS	Default reply-to email (optional)

Usage

Once configured, you can ask Claude or Cursor to send emails:

"Send an email to [email protected] with the subject 'Meeting Tomorrow' and let him know we're meeting at 3pm"

"Email the team a summary of today's work"

"Schedule an email to be sent tomorrow at 9am reminding me about the deadline"

Available Tools

Email Tools

Tool	Description
send_email	Send an email with HTML/text, CC/BCC, scheduling
get_email	Get details and status of a sent email
list_emails	List recent emails from your account
cancel_email	Cancel a scheduled email

SMS Tools

Tool	Description
send_sms	Send an SMS message ($0.0075/segment)
get_sms	Get details of an SMS message

Validation Tools

Tool	Description
validate_email	Validate an email address ($0.01/validation)

Domain Tools

Tool	Description
list_domains	List all verified domains
get_domain	Get domain details and DNS records

Audience & Contact Tools

Tool	Description
list_audiences	List all audiences (contact lists)
create_contact	Add a contact to an audience
list_contacts	List contacts in an audience

Utility Tools

Tool	Description
check_api_status	Verify API connectivity and key validity

send_email Parameters

Parameter	Required	Description
to	Yes	Recipient email(s), comma-separated
subject	Yes	Email subject
html	No	HTML content
text	No	Plain text content
from	No	Sender email (uses default if not provided)
cc	No	CC recipients
bcc	No	BCC recipients
reply_to	No	Reply-to address
scheduled_at	No	ISO 8601 datetime for scheduling

Example

Create an email.md file:

to: [email protected]
subject: Weekly Report

# Weekly Report

Here's what we accomplished this week:

- Launched new feature
- Fixed 12 bugs
- Improved performance by 30%

Best,
Your Team

Then tell your AI: "Send this as an email"

License

MIT