I set message_size_limit = 0 in main.conf and postfix started ok but I wasn't getting mail so I read the docs.
It said mailbox_size_limit must be larger than message_size_limit so I set it to It said mailbox_size_limit = 0 and I got mail. :-) The goal was to be able to receive messages of any size. I'm not sure if that works but at least I get mail again.
