People get banned very rarely, and when they do it is because of repeat offenses, not one minor mistake. Before being banned from whatever it is that is banning them, people usually get warnings, effectively asking them to stop acting in some way that is detrimental to the community. I don't really know what it is you're talking about being banned from, so I can't comment in much greater detail, but if you mean the list servers for some reason, you don't get banned unless you're obviously acting maliciously, which is different from a minor mistake.