why is WHOIS_DMNBYPROXY scoring on _my_ domain?

[snowcrash+spamassassin]

in emails sent TO me ([EMAIL PROTECTED]), i'm noting SA scores of,

        *  0.5 WHOIS_DMNBYPROXY Contains URL registered to Domains by Proxy
        *      [URIs: mydomain.com]

now, "mydomain.com" *IS*, in fact, reg'd @ Domains by Proxy ...
legitimately.  but, why is it scoring on _MY_ domain ?

no doubt i've misconfigured something in local.cf :-/

suggestions?

thanks.