diff --git a/program/js/common.js b/program/js/common.js
index 6cc279534..f9fb9c1db 100644
--- a/program/js/common.js
+++ b/program/js/common.js
@@ -269,7 +269,7 @@ function rcube_check_email(input, inline)
   {
   if (input && window.RegExp)
     {
-    var reg_str = '([a-z0-9][-a-z0-9\.\+_]*)\@(([-a-z0-9][\.]?)*[a-z0-9]\.[a-z]{2,9})';
+    var reg_str = '([a-z0-9][-a-z0-9\.\+_&]*)\@(([-a-z0-9][\.]?)*[a-z0-9]\.[a-z]{2,9})';
     var reg1 = inline ? new RegExp(reg_str, 'i') : new RegExp('^'+reg_str+'$', 'i');
     var reg2 = /[\._\-]{2}/;
     return reg1.test(input) && !reg2.test(input) ? true : false;