What is Model Context Protocol (MCP)?
Model Context Protocol (MCP) is the open standard created by Anthropic that allows AI models like Claude to interact with external tools and data sources securely. Instead of writing custom JSON schemas and REST handlers for every model, an MCP client connects directly to an MCP server that exposes verified tools.
SadaSend runs a hosted, production-grade MCP server at `mcp.sadasend.com` that enables instant email capabilities with built-in guardrails.
Connecting Claude Desktop to SadaSend in 60 seconds
Open your Claude Desktop configuration file (`claude_desktop_config.json`):
• macOS: `~/Library/Application Support/Claude/claude_desktop_config.json`
• Windows: `%APPDATA%\Claude\claude_desktop_config.json`
Add the SadaSend MCP server block:
{
"mcpServers": {
"sadasend": {
"command": "npx",
"args": ["-y", "@sadasend/mcp-server"],
"env": {
"SADASEND_API_KEY": "ssk_live_your_scoped_key_here"
}
}
}
}The four core MCP email tools
Once connected, Claude automatically discovers four native tools in its interface:
- `send_email`: Dispatches an email with subject, markdown body, and recipient validation.
- `draft_email`: Composes a message into your approval queue without sending.
- `check_delivery_status`: Queries delivery telemetry, bounces, and ISP feedback events by message ID.
- `verify_domain_status`: Checks current DNS records (SPF, DKIM, DMARC) for a sending domain.
Prompting Claude with email capabilities
Restart Claude Desktop. You can now prompt Claude directly:
*"Check our domain health for mycompany.com, and send a summary email to dev@mycompany.com with the findings."*
Claude will call `verify_domain_status`, inspect the DNS records, format a markdown report, and invoke `send_email` through SadaSend with full cryptographic verification.