[Mimedefang] filter based on From/To headers?

[kamal]

> I need to check for 'invalid' From and To headers in our inbound email
> (primarily to catch spam that inserts 'JUNK at mail_server_hostname' into
> either header.)  Does anyone have an example of how they did this or
> pointers on where to wedge it in?

open FH, "<HEADERS" or md_syslog("warning","couldn't open headers file");
my($from);
while(<FH>){
	if($_ =~ /^from:/i){
		$from=substr($_,5);
		last;
	}
}
$from contains the from address including name, similarly you can to for 
To header