Stop Polling for OTPs — Use a Disposable Inbox API with Real-Time WebSocket Push

If you've ever written an end-to-end test that covers an email verification flow, you know the pain. You call your sign-up endpoint, an email goes out, and then... you poll. You sleep 2 seconds, check the inbox, sleep again, check again, pray the CI server isn't slow today. It works. It's also fragile, slow, and annoying to maintain. This post covers a better approach: using a disposable inbox API ( FreeCustom.email ) that gives you a real inbox per test run, automatic OTP extraction, and a WebSocket connection that pushes the email to you the moment it arrives — no polling, no sleeps, no flakiness. The problem with polling The standard approach looks like this: await signUp ({ email : ' test123@mailinator.com ' , password : ' hunter2 ' }); // 🤢 please don't do this let otp = null ; for ( let i = 0 ; i < 10 ; i ++ ) { await sleep ( 2000 ); const messages = await checkMailinator ( ' test123 ' ); if ( messages . length > 0 ) { otp = extractOtp ( messages [ 0 ]. body ); // regex hell brea