Re: namedroppers, continued

> > proposal of mailfrom dns record - http://www.vix.com/~vixie/mailfrom.txt or
> I've had a look at vixies proposal and it's a good one.  I certainly would
> welcome something like the mailfrom dns record.
actually I'd call it a nonstarter in its current form.  given that

- mail from is used for nondelivery reports and other notifications;
  users need to make sure it gets set to an address that they'll read

- nomadic users have valid reasons to post from random places on the net 
  (including multiple ISPs) and keep the same mail from address.

- many ISPs won't let you forward or submit mail through someone else's 
  SMTP server, even if you have permission to do so.  so you can't 
  forward your mail through your "home" ISP's mail server to allow the
  "mail from" check to work.

trying to reuse any of the existing return addresses in email as a 
spam identifier just won't fly.  a separate identifier might work.
(actually Sender is the closest thing to what is needed here, 
unfortunately it's routinely munged by mailing lists)

Keith