moore@cs.utk.edu (Keith Moore) writes: > > 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 that problem doesn't change. all the mailfrom draft says is that you need to be coming from a designated server to be able to set MAIL FROM. > - nomadic users have valid reasons to post from random places on the net > (including multiple ISPs) and keep the same mail from address. then, i'm sorry that i'm such a poor writer. i tried to cover this case: 3.3. Roaming hosts such as laptop computers will probably not be able to be listed in the MAIL-FROM MX RR for their return address domain name, and may be forced to use an intermediary for outbound e-mail. STARTTLS or an SSL/SSH tunnel back "home" may become a necessary first hop for mobile e-mail. > - 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. in that case you'd be wise to not insert a MAIL-FROM MX for your domain. -- Paul Vixie