Index: modules/system/system.admin.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.admin.inc,v
retrieving revision 1.58
diff -u -p -r1.58 system.admin.inc
--- modules/system/system.admin.inc	17 Jan 2008 16:08:35 -0000	1.58
+++ modules/system/system.admin.inc	25 Jan 2008 15:57:33 -0000
@@ -1181,8 +1181,11 @@ function system_site_information_setting
  * Validate the submitted site-information form.
  */
 function system_site_information_settings_validate($form, &$form_state) {
+  // If is a RFC 2822 mailbox with the format "display name" <addr-spec>,
+  // extract the address to pass validation.
+  preg_match('/^"[^\"\f\n\r\t\v]+" <(.+)>$/', $form_state['values']['site_mail'], $matches);
   // Validate the e-mail address.
-  if ($error = user_validate_mail($form_state['values']['site_mail'])) {
+  if ($error = user_validate_mail($matches ? $matches[1] : $form_state['values']['site_mail'])) {
     form_set_error('site_mail', $error);
   }
   // Validate front page path.