RE: Lazy network operators

Steven M. Bellovin wrote:
The spammers are already creating throw-away domains;

Indeed, a little stockpile has never hurt anybody; by registering them
now they'll even have some that have been registered for 11 months when
they use them in March 2005. There already are RHSBLs lookup shops that
attempt to block these as well.

they'd do the same with mail sender authorizations.

True; although they will not suppress spam mail sender authorization
schemes do have two advantages: a) they will curb some (from the dumber
spammers that still send their crud on behalf of and b) they will seriously reduce phishing
schemes on behalf of or