Email alias detection identifies when a user has utilized the plus addressing feature available in many email services, such as
[email protected]. The API separates the main email address (
[email protected]) from the alias portion (alias), allowing you to identify when the same user might be registering multiple accounts with different aliases. This is critical for preventing abuse of free trials, referral programs, promotional offers, and signup bonuses where bad actors create dozens of accounts using aliases of a single email. The API also detects dot-based aliasing used by Gmail, where
[email protected] and
[email protected] route to the same inbox, giving you a complete picture of potential duplicate registrations.