Index: mailchimp.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/mailchimp/mailchimp.module,v
retrieving revision 1.2.2.1.2.3.2.8.2.89
diff -u -r1.2.2.1.2.3.2.8.2.89 mailchimp.module
--- mailchimp.module	28 Dec 2010 23:52:25 -0000	1.2.2.1.2.3.2.8.2.89
+++ mailchimp.module	30 Dec 2010 16:39:49 -0000
@@ -531,10 +531,10 @@
 
       $success = _mailchimp_subscribe_user($list['list'], $list['EMAIL'], $list, TRUE);
 
-      if ($success) {
+      if ($success && !$list['list']->doublein) {
         $msg = variable_get('mailchimp_subscription_success_message', t('Thank you, you have been successfully subscribed.'));
       }
-      else {
+      else if (!$success) {
         $msg = variable_get('mailchimp_subscription_failure_message', t('We were unable to subscribe you at this time. Please try again later.'));
       }