Fixed regex for email filed to allow _ in email addresses.

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

@@ -108,7 +108,7 @@ $form["tabs"]['dns_soa'] = array (
 			'validators'	=> array ( 	0 => array (	'type'	=> 'NOTEMPTY',
 														'errmsg'=> 'mbox_error_empty'),
 										1 => array (	'type'	=> 'REGEX',
-														'regex' => '/^[[a-zA-Z0-9\.\-]{0,64}\.$/',
+														'regex' => '/^[[a-zA-Z0-9\.\-\_]{0,64}\.$/',
 														'errmsg'=> 'mbox_error_regex'),
 									),
 			'default'	=> '',