X-AntiAbuse: Original Domain header

[Tracee]

Hi guys,

I'm a little green to SA & its rules but wouldn't it make sense to have a rule that acts upon the

     X-AntiAbuse: Original Domain: your.domain.here header? 

If it matches your own domain name then give it high rating.  There must be a good reason why SA hasn't done this already so I'd like your input before I attempt to write my own rule.

Thanks!