diff --git a/program/lib/Roundcube/rcube_utils.php b/program/lib/Roundcube/rcube_utils.php
index eef554eb3..162d4cb8d 100644
--- a/program/lib/Roundcube/rcube_utils.php
+++ b/program/lib/Roundcube/rcube_utils.php
@@ -156,7 +156,7 @@ class rcube_utils
                 $length = strlen($part);
                 if (!$length) {
                     // there can be only one ::
-                    if ($found_empty) {
+                    if ($found_empty && $idx > 2) {
                         return false;
                     }
                     $found_empty = true;