sendmail: Add support for smart host. This setting also adds mail hub and relay server to really really make the mail move towards defined smart host.

sendmail/manifests/init.pp

@@ -158,6 +158,10 @@ class sendmail::client::msa inherits sendmail::client {
 #   $mail_domain:
 #       SMTP domain name.
 #
+#   $mail_smart_host:
+#       Deliver all mail to host defined. Add leading dot.
+#       $mail_smart_host = "mail.example.com."
+#
 #   $masquerade_exception:
 #       Everything is masqueraded to $mail_domain except these hosts.
 #