If there were some sort of smtp callback pki, as long as you controled your dns and server you could do something useful on that front.
here's an example i gave last night in a private e-mail: -- snip -- There is an important need to perform callback but allow for the ability to protect information from possible spammers for harvesting/verificiation. eg: 220 welcome, but no spam ehlo spammer 250-callback-secure 250 help mail from:<[EMAIL PROTECTED]> callback=spammer.example.com 250 ok rcpt to:<[EMAIL PROTECTED]> 451 try again, pending callback vs: 220 welcome, but no spam ehlo spammer 250-callback-secure 250 help mail from:<[EMAIL PROTECTED]> callback=spammer.example.com 250 ok rcpt to:<[EMAIL PROTECTED]> 550 no such user here there's also the need to do some sort of pki to allow callback to be secure. eg: the dns record for nether.net should have some public-key in it and then some other stuff like possibly mail from:<[EMAIL PROTECTED]> callback=validate.hotmail.com;key=<alkjsdfj> then pass the 'key' through the public-key availble via dns to provide back an authentication system to allow for more secure callback. but this can still be abused depending... just some thoughts, -- snip -- - jared On Wed, Aug 21, 2002 at 02:38:31PM -0500, Larry Rosenman wrote: > > What about individuals that run their own mail servers? (E.G. me).? > > > > On Wed, 2002-08-21 at 14:28, Derek Samford wrote: > > > > I really like this. A sort of IRR for mail servers. Maybe when > > registered it could even check if the server was an open relay, and not > > allow those servers to be registered until properly configured. Any > > thoughts? > > > > Derek > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf > > Of > > > Mark Segal > > > Sent: Wednesday, August 21, 2002 3:12 PM > > > To: 'Robert Blayzor'; [EMAIL PROTECTED] > > > Subject: RE: IETF SMTP Working Group Proposal at smtpng.org > > > > > > > > > > It's almost to the point to where mail servers need their own > > > > "registrar", sort of the way domains are tracked now, track > > > > mail servers. Give mail server admins the option to accept > > > > mail from registered mail servers only or from any mail > > > > server. Of course there would need to be a ramp up period, > > > > like six months to a year, to make sure all of your mail > > > > servers are registered. And of course one should only be > > > > able to register mail servers if the IP space is actually > > > > SWIP to them. If the IP space is NOT SWIP, it would need to > > > > be registered by the customer ISP or via owners rwhois > > > > server. Just my $.02; for what it's worth.... > > > > > > Really good idea (no sarcasm, I actually like it).. But what stops > > > spammers > > > from registering their mail server?..Ie.. > > > 1) Get a dsl account > > > 2) Ips get swipped to you > > > 3) Register the server > > > 4) SPAM > > > 5) Apologize, get a second chance > > > 6) get booted off > > > 7) Call the next ISP with a zero install > > > 8) Rinse and repeat. > > > > > > > > > Regards, > > > Mark > > > > > > -- > > > Mark Segal > > > Director, Data Services > > > Futureway Communications Inc. > > > Tel: (905)326-1570 > > > -- > Larry Rosenman http://www.lerctr.org/~ler > Phone: +1 972-414-9812 E-Mail: [EMAIL PROTECTED] > US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749 -- Jared Mauch | pgp key available via finger from [EMAIL PROTECTED] clue++; | http://puck.nether.net/~jared/ My statements are only mine.