diff -U3 -r redmine-0.6.4/app/models/mailer.rb /var/www/html/redmine/app/models/mailer.rb
--- redmine-0.6.4/app/models/mailer.rb	2008-03-12 14:10:48.000000000 -0400
+++ /var/www/html/redmine/app/models/mailer.rb	2008-04-25 15:33:04.000000000 -0400
@@ -40,6 +40,14 @@
          :issue_url => url_for(:controller => 'issues', :action => 'show', :id => issue)
   end
   
+  def issue_due(issue)
+    recipients issue.recipients    
+    cc(issue.watcher_recipients - @recipients)
+    subject "[#{issue.project.name} - #{issue.tracker.name} ##{issue.id}] is due on #{issue.due_date}"
+    body :issue => issue,
+         :issue_url => url_for(:controller => 'issues', :action => 'show', :id => issue)
+  end
+
   def document_added(document)
     recipients document.project.recipients
     subject "[#{document.project.name}] #{l(:label_document_new)}: #{document.title}"