New rule for 'Message rejected due to content restrictions'

[grvpanchal]

I am trying to make a new rule on phpmailer-bmh_rules.php

/* rule: unknown
* sample:
* Diagnostic-Code: smtp; 5.3.0 - Other mail system problem 550-'5.7.1 Message rejected due to content restrictions' (delivery attempts: 0)
*/
elseif (preg_match ("/Message rejected due to content restrictions/is",$diag_code)) {
$result['rule_cat'] = 'unknown';
$result['rule_no'] = '0240';

}

I have added a rule for body and it worked out. however this $diag_code rule doesnt work. Does anyone have solution or reason for this please. Thanks