SolvedNew to Cracking

Hey guys, i'm new to cracking and a few questions arose, with one i'm particularly interested in.

I've been reading about players who have been banned/temp for spamming the log in to check for working accounts.
How are these players aware that they're banned? Are they prevented for logging in, or do they receive a warning from Mojang (Via Email) + a temp ban from logging in to any accounts?

Please help


(No i'm not banned, I want to know before I actually start cracking)

Their IP is blacklisted for a while I think. (like a couple of minutes)
No. There is no warning, you just can't login even if you got the right username+password