IsTempMail

IsTempMail is a real-time API that detects disposable, temporary, and throwaway email addresses at signup — so you can block fake users before they reach your database. It's backed by a 130,000+ domain blocklist updated multiple times daily, and returns clear blocked and unresolvable fields you can act on instantly.

Control AI spend

Stop abusers from minting trial accounts that burn GPU minutes, API credits, and generation quotas

Stop free-trial abuse

Keep paid features paid; protect unit economics

Protect deliverability

Fewer bounces, better sender reputation

Clean metrics

Honest activation, conversion, and retention numbers

Cut fraud signals

Block fake signups before they pollute your funnel

Trusted by traditional SaaS and AI-native teams alike. We power Botpress, Chatfuel, Lovo, and many others. Also ships as a WordPress plugin (free + premium) with form-level rules, plus bulk checking, personal block/allow lists, and domain reporting.