email-gateway

SKILL.md

Multi-provider email API with Resend, SendGrid, Mailgun, and SMTP2Go support.

Supports four email providers with provider-agnostic abstractions for easy migration, each optimized for different use cases (React Email templates, enterprise scale, developer webhooks, or reliable relay)

Handles transactional emails, batch sending (50–1000 recipients per request), dynamic templates, attachments, and webhook event tracking for bounces, complaints, opens, and clicks

Includes TypeScript types, rate limiting patterns, exponential backoff retry logic, and webhook signature verification for all providers

Built for Cloudflare Workers and Node.js with environment variable configuration and KV-based rate limit tracking

Email Gateway (Multi-Provider)

Status: Production Ready ✅
Last Updated: 2026-01-10
Providers: Resend, SendGrid, Mailgun, SMTP2Go

Quick Start

Choose your provider based on needs:

Provider
Best For
Key Feature
Free Tier

Resend
Modern apps, React Email
JSX templates
100/day, 3k/month

SendGrid
Enterprise scale
Dynamic templates
100/day forever

Mailgun
Developer webhooks
Event tracking
100/day

SMTP2Go
Reliable relay, AU
Simple API
1k/month trial