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Newsletter system with double opt-in, GDPR-compliant

Build your own newsletter sign-up the way German law expects it: consent with a stored text version, double opt-in, one-click unsubscribe, bounce handling and clean DNS. With working code for Resend and a Postgres table.

€59one-time payment
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Needs your own domain with access to its DNS settings, a website or app where you can add a server route (e.g. Next.js), a Postgres database (e.g. Supabase or your own server), a Resend account and Node.js 20+. Basic coding knowledge or an AI coding agent such as Claude Code or Codex. The legal parts are general information, not legal advice.

Self-study course: slides, hands-on tasks and templates, at your own pace. No graded tests, no individual tutoring.

For whom

Self-employed people, creators and small businesses in Germany who want to collect email addresses for a newsletter and want to understand and own the process.

Where you end up

A working sign-up with double opt-in on your own domain, a subscriber table with consent proof, sending via Resend with List-Unsubscribe, webhooks for bounces and complaints, SPF/DKIM/DMARC set up, and a welcome sequence ready to send.

Contents

  1. 01 · The legal frame
  2. 02 · Choosing a tool
    • Hosted newsletter tool or your own stack?10 min
  3. 03 · Building your own stack
    • Sign-up form, consent checkbox and honeypot15 min
    • Confirmation token and consent proof15 min
    • Sending with Resend and one-click unsubscribe15 min
  4. 04 · Deliverability
    • Bounces and complaints via webhooks12 min
    • SPF, DKIM, DMARC and deliverability basics14 min
  5. 05 · Writing and measuring
    • Lead magnet, welcome sequence and measuring without pixels14 min

Material

  • Consent and email text templates (DE + EN)
  • SQL: subscribers, consent texts, events (Postgres)
  • Route handlers: sign-up, confirm, unsubscribe, send, webhook (JavaScript)
  • DNS and deliverability checklist (DE + EN)

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