How to Send Emails from Supabase using SMTP or Email API

Supabase can send authentication messages and application notifications through its built-in Auth tools, custom SMTP providers, or third-party email APIs, although its default SMTP service is limited to two emails daily and is intended mainly for testing. The guide uses Mailtrap to demonstrate connecting a Supabase project through an authorized integration or manual SMTP configuration, enabling signup confirmations, invitations, password resets, magic links, and customizable Go-template-based email content, then testing these flows with a Vite-based React authentication form. It also emphasizes security measures including stronger password policies, compromised-password checks, MFA, rate limits, CAPTCHA, and Row Level Security for browser-accessible database data. For event-driven emails, it explains how to create and deploy Deno-based Supabase Edge Functions, connect them to asynchronous Database Webhooks for insert, update, or delete events, and store credentials securely as function secrets. Email delivery can be implemented with Nodemailer over SMTP or the Mailtrap API, with examples covering plain-text and HTML messages, notifications for user creation or deletion, attachments retrieved from Supabase Storage, and delivery to multiple recipients.

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