Email Marketing and Newsletters (with GDPR Basics)

What you will learn

• How a lead magnet, sign-up form and welcome sequence work together
• Which email metrics are reliable and how to calculate revenue per email
• The basic GDPR and UWG requirements for marketing emails in Germany
• Why double opt-in is standard practice for German newsletters

Explanation

Email marketing means sending planned messages to people who have agreed to receive them. Unlike social media, your email list is not controlled by a platform algorithm, so it is often a small business's most valuable marketing asset.

Building the list

• A lead magnet is a free, useful resource offered in exchange for an email address, for example a checklist or a short guide.
• The sign-up form asks only for what you need (usually the email address; a first name is optional) and explains clearly what people will receive and how often.
• A welcome sequence is a series of automatic emails (for example three to five over two weeks) that delivers the lead magnet, introduces you, teaches something useful and then presents your offer.
• Segmentation means splitting the list by interest or behaviour, for example buyers and non-buyers, so each group gets relevant emails.

Metrics

Delivery rate = delivered ÷ sent. Click rate = unique clicks ÷ delivered. Unsubscribe rate = unsubscribes ÷ delivered. Revenue per email = revenue ÷ delivered. The open rate has become unreliable: since 2021, Apple's Mail Privacy Protection can load emails automatically, which counts as an "open" even if no one read it. Base decisions on clicks and sales instead.

GDPR and UWG basics (general orientation for Germany)

The General Data Protection Regulation (GDPR), in German DSGVO, protects personal data such as email addresses. For newsletters, the usual legal basis is consent (Art. 6(1)(a) GDPR). Valid consent must be freely given, specific, informed and unambiguous (Art. 4(11)). Pre-ticked boxes are not valid consent; the Court of Justice of the European Union confirmed this in the Planet49 case (2019). You must be able to prove consent (Art. 7(1)), and people must be able to withdraw it as easily as they gave it (Art. 7(3)), so every email needs an unsubscribe link.

In addition, the German Act against Unfair Competition (UWG, § 7) generally forbids advertising emails without prior express consent. A narrow exception (§ 7(3)) exists for existing customers: you received the address in connection with a sale, you advertise your own similar products, the customer has not objected, and you clearly informed them at collection and in every email that they can object at any time.

Double opt-in means the person enters their address and then confirms by clicking a link in a confirmation email. German courts have accepted it as a suitable way to prove consent, so it is standard practice. The confirmation email itself should not contain advertising. Your email provider processes data on your behalf, so you need a data processing agreement (Auftragsverarbeitungsvertrag, Art. 28 GDPR) with it, and your privacy policy must describe the newsletter. Whether a lead magnet may be tied to a newsletter sign-up is debated; check with a lawyer. This is general orientation, not legal advice.

Worked example

Hypothetical example: Lena has 2,000 confirmed subscribers. She sends one email presenting her €49 template bundle.

Revenue per email (€0.30) lets Lena compare campaigns and estimate the value of list growth. If her email software costs a hypothetical €30 per month, one such campaign covers it many times. Excluded: payment fees, VAT, refunds and the time to write the email.

Common mistake

Practice activity

On paper: you send a campaign to 1,200 subscribers. Delivery rate 98%, 47 unique clicks, 6 purchases of a €35 product and 5 unsubscribes. (1) Calculate delivered emails, click rate, revenue, revenue per email and unsubscribe rate. (2) Name three elements your sign-up process must include to meet the basic rules from this lesson.

Limitations: legal requirements can change and depend on the details; check the current rules with a lawyer or your chamber of commerce (IHK).

Key takeaways

• Use a lead magnet, a simple form and a welcome sequence to turn visitors into subscribers
• Judge emails by clicks, purchases and revenue per email; open rates are unreliable
• Marketing emails in Germany need provable consent (GDPR and UWG § 7) with a narrow existing-customer exception
• Use double opt-in, an unsubscribe link in every email and a data processing agreement with your provider

Next step

In the next lesson you will learn how to set budgets for paid advertising, target the right audience and measure whether ads pay off.