{
 # migrate qmail -> postfix MaxMessageSize FilterType ConcurrencyRemote ConcurrencyLocal DoubleBounceTo
 # we keep qmail as MDA so we can leave DeliveryType DeliveryInstruction
 for  ( qw( MaxMessageSize FilterType ConcurrencyRemote ConcurrencyLocal DoubleBounceTo) ) {
    my $sa = $DB->get('qmail') or next;
    my $value=$DB->get_prop_and_delete('qmail',$_) or next;
    next if (exists $postfix{$_});
    $DB->set_prop('postfix', $_ , $value);
 }

 # TODO we migrate smtp-auth-proxy ; SMTPSmartHost  Userid  Passwd  PeerPort 


}