diff --git a/management/mailconfig.py b/management/mailconfig.py
old mode 100755
new mode 100644
index 2cc5277f..3c002183
--- a/management/mailconfig.py
+++ b/management/mailconfig.py
@@ -148,8 +148,8 @@ def get_mail_users_ex(env, with_archived=False):
 		box_quota = 0
 		percent = ''
 		try:
-			dirsize_file = os.path.join(env['STORAGE_ROOT'], 'mail/mailboxes/%s/%s/maildirsize' % (domain, user))
-			with open(dirsize_file, 'r') as f:
+			dirsize_file = os.path.join(env['STORAGE_ROOT'], f'mail/mailboxes/{domain}/{user}/maildirsize')
+			with open(dirsize_file, 'r', encoding="utf-8") as f:
 				box_quota = int(f.readline().split('S')[0])
 				for line in f.readlines():
 					(size, count) = line.split(' ')