I have this very simple rule: I never reply or try to assist someone whose
address is erronous. I don't see why I should, since the rfc:s state exactly
what should be in the relevant headers. The mailinglists I maintain try drop
all mails with the wrong sender in them.
This mail, e.g. had to be manually fiddled with to prevent bouncing. Fight
this practice, and fight the spamers and not the good guys.
Peter