Stop Multi-Accounting & Free Trial Abuse
Opportunistic users and automated scripts abuse promotional credits and LLM tokens by churning through Gmail dots, plus-addressing, and disposable domains. EmailScore normalizes identities and prevents multi-accounting in <0.3ms.
How Fraudsters Game Your Free Tier
Free trial abusers exploit standard database uniqueness constraints using trivial email tricks.
Subaddress & Salt Stripping
Gmail, Fastmail, and Proton ignore '+' tags ([email protected]). EmailScore strips subaddresses and computes canonical normalized roots before database insertion.
Gmail Dot-Stuffing Normalization
To Gmail, '[email protected]' and '[email protected]' route to the same inbox, creating up to 2^(n-1) unique signup strings. EmailScore collapses all dot variants to a single root.
Deterministic Identity Hash
Our API returns a cryptographic identity hash for every email. Query your existing database to block users trying to redeem welcome bonuses multiple times.
Stop Trial Abuse Without Blocking Legitimate Users
Configure intelligent signup routing based on identity confidence.
Canonical email identity has never been seen across your workspace. Grant standard promotional credits or free trial tier.
User registered using +tagging or dot variations. Require pre-authorization credit card hold or SMS verification before dispensing trial credits.
Identity hash matches existing trial account or domain is a throwaway burner. Block trial provisioning and route to paid checkout.
Frequently Asked Questions
How do I prevent someone from signing up with [email protected] after using [email protected]?
EmailScore returns a normalized identity_hash and normalized_email field in every API response. By storing or indexing the identity_hash in your users table, a unique database constraint automatically prevents repeat signups from the same underlying mailbox.
Do legitimate users use '+' subaddressing?
Yes, many tech-savvy users use subaddressing for filtering. Rather than outright blocking them, our CHALLENGE tier allows you to welcome the user but withhold automated trial credits until identity verification (like card validation) is completed.
What is the computational overhead on our database?
Zero. EmailScore normalizes the string and generates the SHA-256 fingerprint in memory before your database query is executed, saving you from running expensive regex queries across millions of user records.
End Free Trial Fraud Today
Stop burning cloud infrastructure and LLM compute on duplicate free trial accounts.