G Suite is the Soft Underbelly of Your Environment

This blog describes a reconnaissance workflow using MailSniper and HTTP response analysis to enumerate valid G Suite/Gmail accounts by observing distinct JSON response codes (1 = valid, 7 = invalid, 5 = captcha). It explains detecting captcha triggers, bypassing them via IP rotation/proxying, and generating large candidate email lists from name permutations to scale user discovery—techniques that aid phishing, credential stuffing, and targeted access attempts.