Guides for real sign-ups.

Giveaways Fake giveaway entries: spot them, stop them A fake check to try, the usual measures compared and how reverse OTP verifies entries without SMS costs. Read the guide Webinars Webinar no-shows: when reminders never arrive Typos, made-up addresses and blocked seats, and how verified contacts make reminders arrive. Read the guide Newsletters Confirmation email not arriving? Where double opt-in loses subscribers Spam folders, typos and automatic clicks, and how subscribers confirm by sending one email. Read the guide Fraud prevention SMS pumping: spot it, stop it How bots turn SMS codes into a cost trap, the signs in your send log and why received codes cannot be pumped. Read the guide Trust Sending a code via WhatsApp: is it safe? Why the warning about codes is right, what is different with reverse OTP and three signs of a safe flow. Read the guide