I see: http://en.wikipedia.org/wiki/Callback_verification
I agree with Gary on this. I think a SPF checker would be more useful. I know that's already on the list of enhancements. Thanks again. -- -Eric 'shubes' On 07/06/2012 02:33 PM, [email protected] wrote: > I used that for a bit and found that it wasn't very useful. There are a > lot of false negatives and virtually all were rejected by another check. > Today's spammers don't have troubles grabbing a real email address from > their lists. I'd like to see some hard data that would show it > beneficial. There is already a lot of DNS lookups per connection to add > one with no benefit. > > I suppose it would reject backscatter spam but not much else. > > Gary > -- Sent from my HP TouchPad > ------------------------------------------------------------------------ > On Jul 6, 2012 4:43 PM, Mark Frater <[email protected]> wrote: > Hi Eric, > > I'm talking about sender-verification also known as call-out > verification. It can be used for smtp auth or incoming mail or both. > This is where the mail server first verifies that the 'sender's address' > actaully exists before delivering the message. It does this by > connecting to the sender's MX and attempting to send a message to the > sender but quitting before the data command. Usually done as follows: > helo, mail from: <>, rcpt to: sender@domain, check reply, quit. If 250, > sender is verified and the mail is allowed through (and generally the > verification result will also be cached for a variable time so as not to > be abused in floods etc). The reason why I said this feature is of less > importance is because it does have the potential to be abused. Though it > seems quite widely used these days. > > Regards, > Mark > > > On 06 Jul 2012, at 10:07 PM, Eric Shubert > <[email protected]> wrote: > > > Nice suggestions, Mark. Thanks. > > > > On 07/06/2012 12:36 PM, Mark Frater wrote: > >> Lastly and perhaps less as important would be the sender > verification process which is listed in the smtp RFC but which qmail has > no standard ability to perform. Once again this is a standard feature > available in postfix. > > > > Are you talking about smtp-auth capability here, or something else? > > Which RFC/feature? > > > > -- > > -Eric 'shubes' > > > > > > > > _______________________________________________ > > spamdyke-users mailing list > > [email protected] > > http://www.spamdyke.org/mailman/listinfo/spamdyke-users > _______________________________________________ > spamdyke-users mailing list > [email protected] > http://www.spamdyke.org/mailman/listinfo/spamdyke-users > > > _______________________________________________ > spamdyke-users mailing list > [email protected] > http://www.spamdyke.org/mailman/listinfo/spamdyke-users > _______________________________________________ spamdyke-users mailing list [email protected] http://www.spamdyke.org/mailman/listinfo/spamdyke-users
