FS#4070 - DMARC CNAMES cannot be added to ISPConfig

Author: Florian Schaal

interface/web/dns/form/dns_cname.tform.php

@@ -115,7 +115,7 @@
 			'validators' => array (  0 => array ( 'type' => 'NOTEMPTY',
 					'errmsg'=> 'data_error_empty'),
 				1 => array ( 'type' => 'REGEX',
-					'regex' => '/^[a-zA-Z0-9\.\-]{1,255}$/',
+					'regex' => '/^[a-zA-Z0-9\.\-\_]{1,255}$/',
 					'errmsg'=> 'data_error_regex'),
 			),
 			'default' => '',