That is handled on a case-by-case basis. For SWC bans, generally there is contact information listed with the Sim News post of individual bannings--if there isn't, the banned parties can contact firstname.lastname@example.org for more information.
For forum bans, you'll want to get in touch with the person who banned you. That's listed when you try to view that particular forum.
Edited By: Phryss on Year 9 Day 43 3:32 ____________
I dare you to make less sense.
Are you a newbie, or do you have access to newbies?