email-gateway

Status : Production Ready ✅ Last Updated : 2026-01-10 Providers : Resend, SendGrid, Mailgun, SMTP2Go Choose your provider based on needs: Password Reset : Resend (max 50 recipients) : SendGrid (max 1000 personalizations) : Install React Email : Create Template : Send via Resend SDK (Node.js) : Send via Workers (render to HTML first) : SendGrid : Mailgun : Resend : SendGrid : Mailgun (uses FormData with File): Resend Webhooks : Events: email.sent , email.delivered , email.delivery_delayed , email.bounced , email.complained , email.opened , email.clicked SendGrid Webhooks : Mailgun Webhooks : SMTP2Go Webhooks : Common validation errors : Error response format : Common errors : Error response format : Common errors : Error response format : Common errors : Error response format : Production Notes : - to field required - Invalid email format - from domain not verified - Attachment size exceeds 40 MB - Missing personalizations - Invalid template ID - Unverified sender address - Attachment encoding issues - Domain not verified - Wrong region (US vs EU) - Invalid template variables - Recipient address syntax - Sender domain not verified - Invalid recipient format (must use angle brackets: ) - API key not activated - Resend : - SendGrid : - Mailgun : - SMTP2Go : - Always verify sender domains before production - Set up DKIM/SPF/DMARC records for deliverability - Use dedicated IPs for...