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-rw-r--r--program/include/rcmail.php2
1 files changed, 1 insertions, 1 deletions
diff --git a/program/include/rcmail.php b/program/include/rcmail.php
index d07e03c0d..53b4765b9 100644
--- a/program/include/rcmail.php
+++ b/program/include/rcmail.php
@@ -433,7 +433,7 @@ class rcmail
// lowercase username if it's an e-mail address (#1484473)
if (strpos($username, '@'))
- $username = strtolower($username);
+ $username = rc_strtolower($username);
// user already registered -> overwrite username
if ($user = rcube_user::query($username, $host))