We could also have a sticky thread for Ban appeals if you must give them a chance to appeal, Add a link in the message to 1 thread, change the message to say " you are only allowed to appeal your ban here xxx any posting outside of this thread will equate to ban evasion.
I wouldn't be against having a sticky for appeals of which they are only allowed to post in. It would clean Meta up and some people in the past have also tried to bend the rules on technicalities and just started posting in any threads they could in Meta because they're 'technically' only allowed to post in Meta so they'd post in threads that didn't concern them whilst they essentially evaded their ban.
It costs moderators nothing to reply to a user with the reason, as some sometimes claim to be oblivious of what or where the copy pasted.
It costs time and energy which equals money, and that's probably why the current email isn't monitored or replied to as theymos doesn't have time. If we changed the message and appeal process then this would cut down on the need to even address the majority of cases and save everybodies time.
But everyone has a right to appeal, the fact that one user has won such an appeal shows that though rarely there can be flaws, and it would be unfair to the next one user among the thousands.
It's pointless even appealing a permaban in the current system. If they're told what they were banned for and that it's permanent then most except the truly desperate probably wouldn't even bother trying.