As you said you received notif in your email about post deletion, if most of your post had been deleted I guess the reason for you being banned is posting replies or topics that mods consider spammy or nonsense.
Maybe it's the same thing happened to me, but I was convinced that we can't post comments when they are NOT requested, I posted only when the comment has been requested but probably it's a mistake.
If it is the case, my deepest apologies, surely it does not go to happen again but I would be grateful if It is not a permanent ban cause I don't think to be a spammer member of this forum