If the problem persists, e-mails to the banks or other organisations informing them that the e-mail address does not belong to their client, nd also start forwarding all mail which comes for them (inlcluding all spam) to this guy, cc???d to his wife (if you have e-mail addresses for either / both of them) ??? that way, if he does it to reduce clutter in her e-mail box, it will stop being effective