Patch:
Left base folder: mantisbt-1.2.15
Right base folder: mantisbt-1.2.15+
--- core\email_api.php 2013-04-12 09:37:00.000000000 +0200
+++ core\email_api.php 2013-04-16 16:16:12.000000000 +0200
@@ -73,13 +73,13 @@
$trecipient = "([a-z0-9!#*+\/=?^{|}~-]+(?:.[a-z0-9!#+\/=?^_{|}~-]+))";

    # a domain is one or more subdomains
    $t_subdomain = "(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?)";
    $t_domain    = "(${t_subdomain}(?:\.${t_subdomain})*)";

• $s_email_regex = "/${t_recipient}\@${t_domain}/";

• $s_email_regex = "/${t_recipient}\@${t_domain}/i";
  }
  return $s_email_regex;
  }

  /**

  • check to see that the format is valid and that the mx record exists