Gmail 2006-2018 - CK11

Within 2 hours of login, check immediately. If left idle for more than 2 hours, the warranty will no longer apply.
If you have successfully logged in but your account gets locked by Google for verification (VER) or disabled (DIS) due to an unclean device or proxy, there will be no warranty.
Buy one to test, use it for a while, and if it's okay, then buy more.
Gmail | Pass | mailKP