If you see multiple different email addresses from different users linked to one Distinct ID in Mixpanel, the most common reason is improper identity management—specifically, not calling reset() when users log out on shared devices. When reset() is not called, the next user who logs in will inherit the previous user’s distinct_id. If you then call identify() with the new user’s ID, Mixpanel merges the previous and new IDs into a single identity cluster. This causes events (and user properties like email) from both users to appear under the same profile, resulting in multiple email addresses being associated with one Distinct ID.
To prevent this, always call reset() on logout to clear the current session and generate a new ID for the next user. This ensures that each user’s actions and properties are kept separate in Mixpanel. If your backend or frontend sends events for different users but uses the same distinct_id, Mixpanel will also attribute all those events to a single user profile, causing similar issues. Consistently assigning a unique user ID for each user across all platforms is essential for accurate identity management in Mixpanel Identity Management in Mixpanel FAQ.
