At 4:25 PM -0400 2002/08/21, Jared Mauch wrote:
Lets say AOL, hotmail, yahoo all today had a way they could say "we would like to cooperate in validating source addresses as at least somewhat more valid than today" and had a mechanisim to do this with a patch to sendmail/qmail/postfix/zmailer.
Doesn't help. AOL uses a proprietary MTA that they have developed in-house, which would need to be modified. Of course, you'd also need to modify all the other standard MTAs, too. And don't forget about all those Microsoft and Lotus Notes gateways out there.
You could also then start keeping statistics and rate-limit the callback mechanisim. AOL (and i'm sure others) have done "so, you want to bulk-mail aol users, sign here". Including this ability to increase customer satisfaction is in all ISPS interest today.
AOL uses all sorts of mechanisms to try to detect and eliminate spam, but I wouldn't want to go into too much detail here. -- Brad Knowles, <brad.knowles@skynet.be> "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -Benjamin Franklin, Historical Review of Pennsylvania. GCS/IT d+(-) s:+(++)>: a C++(+++)$ UMBSHI++++$ P+>++ L+ !E W+++(--) N+ !w--- O- M++ V PS++(+++) PE- Y+(++) PGP>+++ t+(+++) 5++(+++) X++(+++) R+(+++) tv+(+++) b+(++++) DI+(++++) D+(++) G+(++++) e++>++++ h--- r---(+++)* z(+++)