What is “legitimate interest” in analytics?
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Legitimate interest is one of six lawful bases under GDPR that lets you process personal data without asking for explicit consent. For email analytics, it is the basis most senders lean on. But it is not a free pass.
To claim legitimate interest, you must complete a Legitimate Interest Assessment (LIA). This is a three-part test: identify your legitimate interest (e.g., "measuring campaign performance to improve content"), confirm the processing is necessary to achieve it, and balance it against the subscriber's rights and privacy. If the subscriber's privacy interests outweigh your interest, you cannot use this basis.
For standard email analytics, it typically holds up. Measuring aggregate open rates, tracking click-through rates, analyzing bounce patterns: these have a clear purpose and minimal intrusion. Your privacy policy must describe the processing, its purpose, and how long you retain the data.
Where legitimate interest gets shakier: using individual-level tracking to build detailed behavior profiles, sharing click data with third-party ad platforms, or retargeting subscribers based on email engagement. These uses may need explicit consent instead.
Claiming legitimate interest where consent is actually required is a GDPR violation. "We assumed it was fine" is not a defense regulators have accepted. If your tracking pixel disclosures are vague or buried, that is a risk even if your lawful basis is legitimate interest.
For how privacy laws affect email tracking generally, that covers the full picture across GDPR, CCPA, and ePrivacy. The question of appropriate data retention under data minimization principles is directly related.
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