They go to the chantry or the accusing part. The length of this punishment can vary between a month and a lifetime. Imprisonment in the cells in the cellar is possible, usually as punishment for serious crimes among the servants but mages can in principle be imprisoned too. If the crime is against the Protocols, the aura of the guilty part should be marked with a symbol. This is however never applied except in theory.
Expulsion is possible for severe crimes.
The tongue, hands and mind of the guilty are magickally locked so that he will never be able to reveal anything about the chantry. If necessary, he is given over to profane or ecclesiastical authorities.