tony l svanstrom tonysvanstromcom 4 aug 2002 voices made scott crosby write sun 4 aug 2002 163657 0200 cest tony l svanstrom writes sun 4 aug 2002 voices made tony l svanstrom write solution course public key sort associated domainame registrarlevel email arrives server check sendingserver actually responsible domainuser email appears sent problematic example im home want send email workaddress cant go isps mailserver dont thikn want enforce link linking email address server sending many reasons two things different entities true thats thinking today company mailserver closed outside today use mail server youve got access theres good reason setting wont lazy future however requiring mailservers sign received header could useful assuming signature reasonable size could indicate server email enter system itd also incontravertable proof mailserver allow abused signatures could checked either mx inaddrarpa records indicating hosts public key theres still problems left though youd bind headers message somehow via signatures avoid someone taking email twiddling body claiming spam came particular host would mean couldnt alter body message unforgable received chain would useful evidence simple rfc could fix today either using new header extending receivedheader codevalue server later verify maybe something like received2 date date local subdom2tld ip2 remote subdom3tld ip3 envid code cache salted hashvalue rsa signature two optional added sending server thats identified local sender server accepting mail certain user verify really come via server case forward using procmail something like course would need standard check headers perfect better today tony per scientiam ad libertatem knowledge towards freedom genom kunskap mot frihet c 19992002 tonysvanstromcom perl eprint__ sort_lynx source svanstromcomt sfnet email sponsored bythinkgeek welcome geek heaven httpthinkgeekcomsf _______________________________________________ spamassassintalk mailing list spamassassintalklistssourceforgenet httpslistssourceforgenetlistslistinfospamassassintalk fri 9 aug 2002 045202 0200 cest satalk help someone stole address