1 files changed, 6 insertions, 2 deletions
diff --git a/program/include/rcube_user.php b/program/include/rcube_user.php
index e4506cff7..ee6db77cc 100644
--- a/program/include/rcube_user.php
+++ b/program/include/rcube_user.php
@@ -358,13 +358,17 @@ class rcube_user
     {
         $dbh = rcmail::get_instance()->get_dbh();
 
+        // use BINARY (case-sensitive) comparison on MySQL, other engines are case-sensitive
+        $prefix = preg_match('/^mysql/', $dbh->db_provider) ? 'BINARY ' : '';
+
         // query for matching user name
         $query = "SELECT * FROM ".get_table_name('users')." WHERE mail_host = ? AND %s = ?";
-        $sql_result = $dbh->query(sprintf($query, 'username'), $host, $user);
+
+        $sql_result = $dbh->query(sprintf($query, $prefix.'username'), $host, $user);
 
         // query for matching alias
         if (!($sql_arr = $dbh->fetch_assoc($sql_result))) {
-            $sql_result = $dbh->query(sprintf($query, 'alias'), $host, $user);
+            $sql_result = $dbh->query(sprintf($query, $prefix.'alias'), $host, $user);
             $sql_arr = $dbh->fetch_assoc($sql_result);
         }