Get help on parameters.
Print version information.
Print debug messages (Be careful! This is really verbose)
Check tmp directories for old files
Expire mailbox contents
Check and report size of all mailboxes
Check names, ownership, and permissions of all dirs/files
Put mail in mailboxes that are over quota (implies -c)
Backup deleted mailboxes
Read options from this file
Don't do anything, just print what you would do (implies -D)