What are the limits of click tracking under GDPR/consent rules?

Every time a subscriber clicks a link in your email, your ESP logs their identity, the timestamp, which link was clicked, and their IP address. Under GDPR, that's personal data processing. You need a legal basis for it.

Legitimate interest vs. consent. In B2B email, legitimate interest often covers analytics tracking because understanding how subscribers engage is reasonably connected to the business relationship. In B2C, the picture is murkier. Behavioral tracking at the individual level frequently requires explicit consent, not just a checkbox you ticked at signup to receive marketing emails.

Disclosure is non-negotiable. Your privacy policy must explain what you track, why, and how long you retain it. "We use click data to personalize future emails" is the kind of language that needs to be there. Tracking subscribers without disclosure, even if your legal basis is solid, creates compliance exposure.

Timing matters. Tracking clicks on a confirmation email that goes out before a subscriber has fully opted in is a gray area at best. The tracking shouldn't start until the legal basis is established.

Third-party integrations multiply the scope. If you're passing click-level data to a CRM, advertising platform, or retargeting tool, each integration is part of your data processing chain. Each one needs to appear in your privacy documentation and have appropriate data processing agreements in place.

In practice, most major ESPs handle click tracking under their own data processing agreements with senders. But you're responsible for what you do with the data downstream. If you're unsure where your setup stands, it's worth a conversation with a privacy lawyer rather than guessing. An email specialist at Review My Emails can point you in the right direction on the technical side.