[EMAIL PROTECTED] (Sean Donelan) writes: > A Google search turned up http://www.unixwiz.net/techtips/pacbell-rdns.html > > But wouldn't this defeat the very behavior you are depending on to > block mail? If every network administrator had reverse DNS for every > IP address, your check for systems lacking rDNS wouldn't work.
that's one check of many. the PTR has to match the HELO, which means all of the worms and spammers who forge @yahoo.com addresses and use YAHOO.COM as their HELO will continue to get hammered. > Or do we actually want a Fortune 1000 network. Direct communications > are prohibited between most users. If you are not a Fortune 1000 network, > you must forward your email through an approved provider which will check > the mail for unauthorized content. yes, actually, that's what we're headed for. > Suppose AOL, MNN, Yahoo, etc agree to accept mail from each other and not > from other people. This is pretty much how the world worked from > 1980-1990. CompuServe, MCIMail, The Source, Delphi, etc. fine by me. the people i want to exchange mail with aren't AOL users anyway. -- Paul Vixie