# Sendkit - Build Your Entire Email Stack in a Conversation

> Sendkit is an email platform with a native MCP server. Your AI agent can send emails, create campaigns, build automations, manage contacts, and pull delivery metrics. Transactional and marketing email in one API, with REST API, SMTP relay, and a visual dashboard.

## About Sendkit

Sendkit handles transactional and marketing email from a single platform. REST API, SMTP relay, 10 language SDKs, visual campaign builder, automation workflows, contact management, and email validation.

What makes it different: Sendkit ships with a Model Context Protocol (MCP) server with 60 tools. Connect it to Claude, Cursor, VS Code, or any MCP-compatible client and manage your entire email infrastructure through conversation. Everything you can do in the dashboard, your AI agent can do too.

### Who it's for

- Developers sending transactional email who want one platform for everything
- Founders running both transactional and marketing email without stitching tools together
- Teams using AI agents to manage email infrastructure through MCP

## MCP Server

Sendkit's MCP server exposes 60 tools across 13 categories. Connect your AI client and manage email infrastructure through natural language.

### What your AI agent can do

- Send transactional emails and check delivery status
- Create and manage sending domains with DNS verification
- Build automation workflows with triggers and conditions
- Launch email campaigns to segments or lists
- Manage contacts, lists, and custom properties
- Create and render email templates
- Validate email addresses
- Pull delivery metrics and monitor sender reputation
- Manage API keys and suppression lists

### Supported clients

Claude Code, Claude Desktop, Cursor, Windsurf, VS Code, GitHub Copilot, Gemini CLI, OpenCode, and Codex.

### Setup

1. Create an API key with "Full" permissions in the Sendkit dashboard
2. Point your client to `https://mcp.sendkit.dev/sendkit`
3. Authenticate with your API key as bearer token

Documentation: https://sendkit.dev/docs/ai/introduction

## Features

### Email API & SMTP
- REST API with JSON request/response format
- SMTP relay with TLS (port 465 implicit TLS, port 587 STARTTLS)
- SMTP credentials: host smtp.sendkit.dev, username sendkit, password is your API key
- Official SDKs for 10 languages: Laravel, Node.js, Python, PHP, Ruby, Go, .NET, Java, Elixir, and Rust
- Webhooks for delivery events (opens, clicks, bounces, complaints, unsubscribes)
- HMAC-SHA256 signed webhook payloads
- Template API with Handlebars variable support
- Inbound email parsing via webhook
- Rate limiting with automatic retry and exponential backoff
- DKIM, SPF, and DMARC authentication
- Batch sending support

### Email Campaigns
- Drag-and-drop email editor
- Reusable template library
- A/B testing for subject lines and content
- Scheduled and immediate sending
- List segmentation for targeted campaigns
- Campaign analytics (opens, clicks, bounces, unsubscribes)

### Automations
- Visual workflow builder
- Event-based triggers (signup, purchase, custom events)
- Conditional branching and time delays
- Drip campaigns and onboarding sequences
- Webhook actions to trigger external services
- Per-step performance analytics

### Contact Management
- Rich contact profiles with custom properties
- Dynamic segments based on behavior and attributes
- Lists and tags for organization
- CSV import and export
- API sync for real-time updates
- Suppression list management

### Email Validation
- Syntax validation
- MX record verification
- Disposable email detection
- Mailbox verification
- Role-based address detection
- REST API for real-time validation
- Automatic blocking of invalid addresses before sending
- Smart caching (valid results cached 90 days, invalid 180 days)

### Analytics
- Delivery, open, and click rates
- Bounce and complaint tracking
- Engagement trends over time
- Per-recipient activity logs
- Full email logs with search and filter
- Sender reputation monitoring

## Pricing

Pricing is based on email volume per month. All plans include unlimited contacts.

### Free Tier
- $0/mo, no credit card required
- 3,000 emails/month, 1 domain
- 7-day data retention
- 60 requests/minute rate limit

### Transactional Plan
Includes: REST API, SMTP, open & click tracking, dynamic suppression, webhooks, unsubscribe management.

- **10K**: $15/mo — 10,000 emails, 5 domains
- **25K**: $25/mo — 25,000 emails, 10 domains
- **50K**: $45/mo — 50,000 emails, 25 domains
- **75K**: $60/mo — 75,000 emails, 50 domains
- **100K**: $75/mo — 100,000 emails, 100 domains
- **150K**: $100/mo — 150,000 emails, 200 domains
- **250K**: $150/mo — 250,000 emails, 500 domains
- **500K**: $250/mo — 500,000 emails, 1,000 domains
- **750K**: $350/mo — 750,000 emails, 1,000 domains
- **1M**: $450/mo — 1,000,000 emails, 1,000 domains
- **2M**: $750/mo — 2,000,000 emails, 1,000 domains
- **5M**: $1,500/mo — 5,000,000 emails, 1,000 domains

### Marketing + Transactional Plan
Everything in Transactional, plus: campaigns, automations, unlimited contacts, lists, segments, and campaign analytics.

- **10K**: $30/mo — 10,000 emails, 5 domains
- **25K**: $50/mo — 25,000 emails, 10 domains
- **50K**: $80/mo — 50,000 emails, 25 domains
- **75K**: $100/mo — 75,000 emails, 50 domains
- **100K**: $130/mo — 100,000 emails, 100 domains
- **150K**: $170/mo — 150,000 emails, 200 domains
- **250K**: $250/mo — 250,000 emails, 500 domains
- **500K**: $400/mo — 500,000 emails, 1,000 domains
- **750K**: $550/mo — 750,000 emails, 1,000 domains
- **1M**: $700/mo — 1,000,000 emails, 1,000 domains
- **2M**: $1,150/mo — 2,000,000 emails, 1,000 domains
- **5M**: $2,250/mo — 5,000,000 emails, 1,000 domains

### Paid plans include
- 30-day data retention
- Unlimited templates
- $1.00 per 1,000 additional emails (overage)
- Dedicated IP eligible on 100K+ tiers

## Security

- TLS encryption for all connections
- DKIM, SPF, and DMARC authentication
- HMAC-SHA256 webhook signing
- API key authentication with scoped permissions
- 99.9% uptime SLA

## Links

- **Website**: https://sendkit.dev
- **Dashboard**: https://app.sendkit.dev
- **Documentation**: https://sendkit.dev/docs
- **API Reference**: https://sendkit.dev/docs/api-reference
- **MCP Server Docs**: https://sendkit.dev/docs/ai/introduction
- **Knowledge Base**: https://sendkit.dev/docs/knowledge-base
- **Product Updates**: https://sendkit.dev/updates
- **Pricing**: https://sendkit.dev/pricing
- **Email Campaigns**: https://sendkit.dev/email-campaigns
- **Automations**: https://sendkit.dev/automations
- **Contacts**: https://sendkit.dev/contacts
- **Email API**: https://sendkit.dev/email-api
- **SMTP Service**: https://sendkit.dev/smtp-service
- **Email Validation**: https://sendkit.dev/email-validations
- **Analytics**: https://sendkit.dev/analytics
- **MCP**: https://sendkit.dev/mcp
- **Blog**: https://sendkit.dev/blog
- **Status**: https://status.sendkit.dev
- **GitHub**: https://github.com/sendkitdev
- **X/Twitter**: https://x.com/sendkitdev
- **Terms of Use**: https://sendkit.dev/terms
- **Privacy Policy**: https://sendkit.dev/privacy
- **Cookie Policy**: https://sendkit.dev/cookies