#/etc/puppet/modules/profile/manifests/linux/service/exim4d.pp
#class { 'profile::linux::service::exim4d': arg => 'mysmtp2.my.dom.ain',}

    class profile::linux::service::exim4d ($arg ='mysmtsrv',) {

        class { '::eximsimple':
            smarthost => $arg,
            root      => "root@$::fqdn",
            domain    => $::domain,
        }
}