Index: branches/version-2_5-dev/data/class/helper/SC_Helper_Mobile.php
===================================================================
--- branches/version-2_5-dev/data/class/helper/SC_Helper_Mobile.php	(revision 19692)
+++ branches/version-2_5-dev/data/class/helper/SC_Helper_Mobile.php	(revision 19723)
@@ -456,5 +456,5 @@
 
         foreach ($arrMobileMailDomains as $domain) {
-            $domain = str_replace('.', '\\.', $domain);
+            $domain = preg_quote($domain, '/');
             if (preg_match("/@([^@]+\\.)?$domain\$/", $address)) {
                 return true;