Missed this one: > message_size_limit = 52428800 > virtual_mailbox_limit = 5242880000 > > message_size_limit needs to be less than or equal to > virtual_mailbox_limit. Your virtual_mailbox_limit is > 100 times message_size_limit.
Not intentional, definitely a typo. I think early on I saw mailbox_size_limit and thought that's what I wanted.