diff --git a/include/class.ticket.php b/include/class.ticket.php
index 6b54bb016ee117effa4fef062802dfaede244125..c31f155d67fb6ff590ef01d59fec24ecc28c9058 100644
--- a/include/class.ticket.php
+++ b/include/class.ticket.php
@@ -1117,7 +1117,7 @@ class Ticket {
             // Skip all the other recipients of the message
             foreach ($entry->getAllEmailRecipients() as $R) {
                 foreach ($recipients as $R2) {
-                    if ($R2->getEmail() == ($R->mailbox.'@'.$R->hostname)) {
+                    if (0 === strcasecmp($R2->getEmail(), $R->mailbox.'@'.$R->host)) {
                         $skip[$R2->getUserId()] = true;
                         break;
                     }