diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index e55320eb3..86c30cadc 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -78,14 +78,14 @@ module ApplicationHelper
     user.nil? ? mail : user.try(:show_name)
   end
 
-  def link_to_user_mail(mail, options={})
+  def link_to_user_mail(mail, css_class)
     user = User.find_by_mail(mail)
     user = user.nil? ? mail : user
     if user.is_a?(User)
       name = user.show_name
-      link_to name, {:controller=> 'users', :action => 'show', id: user.id}, :class => user.css_classes
+      link_to name, {:controller=> 'users', :action => 'show', id: user.id}, :class => css_class, :target => "_blank"
     else
-      h(user.to_s)
+      "<a class='#{css_class}'>#{h(user.to_s)}</a>".html_safe
     end
   end