diff --git a/templates/default/main.cf.erb b/templates/default/main.cf.erb
index 9083ec5..029ce49 100644
--- a/templates/default/main.cf.erb
+++ b/templates/default/main.cf.erb
@@ -20,7 +20,9 @@ smtp_tls_CAfile = <%= node['postfix']['smtp_tls_cafile'] %>
 smtp_use_tls = <%= node['postfix']['smtp_use_tls'] %>
 <% end -%>
 myhostname = <%= node['postfix']['myhostname'] %>
+<% if node['postfix']['domain'] %>
 mydomain = <%= node['postfix']['mydomain'] %>
+<% end -%>
 myorigin = <%= node['postfix']['myorigin'] %>
 smtpd_banner = $myhostname ESMTP $mail_name 
 alias_maps = hash:/etc/aliases