# Every one of our hosts has an MTA
#
# @param type exim4 or postfix.  exim4 is our default MTA
# @param heavy receive email from the internet and thus do spam filtering etc
# @param mailrelay receive mail on other hosts' behalf.  implies heavy
class roles::mta(
  Enum['exim4', 'postfix'] $type = 'exim4',
  Boolean $heavy = false,
  Boolean $mailrelay = false,
) {
  if $type == 'exim4' {
    if $mailrelay {
      include roles::mailrelay
    } elsif $heavy {
      include exim::mx
    } else {
      include exim
    }
  } elsif $type == 'postfix' {
    if $mailrelay {
      fail("Unsupported: mailrelay on type ${type}")
    }
    include postfix
  } else {
    fail("Unexpected mta type ${type}")
  }
}