---
postfix_instance:
  # The keys are the group names associated with a Postfix role, and the
  # values are the name and group (optional) of the instance dedicated
  # to that role.
  IMAP:    { name: mda                }
  MX:      { name: mta-in, group: mta }
  MTA-out: { name: mta-out,group: mta }
  MSA:     { name: msa                }