> But still, my recommendation is to use an SPF pass to decrease the > spam > score and to not use SFP fails to blacklist.
This is really the first post I've looked at on this thread, but I see your point...correct me if I am wrong with this situation: I work for an ISP. My laptop, seldomly moved from the office is configured to send out my [EMAIL PROTECTED] email through this ISP SMTP server. I take my laptop home, which is connected to a different SMTP server. Unwittingly, I change the SMTP server to the home ISP's server and send out mail (which was always a common practice). AFAICT, this instance would blacklist me and/or my entire domain because of a user mistake...correct? (As it would send my [EMAIL PROTECTED] email through a server not listed in our SPF records). Steve > > On Sep 13, 2004, at 1:39 PM, Kelson wrote: > >> You're misunderstanding. The suggestion was to take spam that >> passed >> SPF, look for the other servers listed in that SPF record, and add >> those servers to a blacklist. >> >> 1. Spam comes in from dirtbag.tld via mail.dirtbag.tld >> 2. SPF record for dirtbag.tld lists both mail.dirtbag.tld and >> mail.yahoo.com as valid senders (even though they can't actually >> send >> through Yahoo): "v=spf1 a:mail.dirtbag.tld a:mail.yahoo.com -all" >> 3. Your mail server recognizes that (a) it's spam, and (b) it passes >> SPF. >> 4. As per the original suggestion, check that SPF records for >> blacklist material, and you add mail.dirtbag.tld and mail.yahoo.com >> to >> your blacklist. >> 5. Next time mail comes in from mail.yahoo.com, it's blocked. >> >> Of course, there's no reason for spammers to put bogus info in their >> SPF records *unless* people do this, since if people use it as >> designed, it won't gain them anything. Although I can see them just >> putting up "v=spf1 +all" at least short-term so that they can use >> their usual zombie networks, though at least they'd have to use >> their >> own addresses and deal with the bounces themselves. >> > > Kindest regards, > > Ron > > "What shall we do? What shall we do?" he cried, "Escaping goblins to > be > caught by wolves!" - Bilbo Baggins > > The Hobbit by J. R. R. Tolkein > http://www.apple.com/trailers/newline/returnoftheking/trailer_large.html > >
