From: "Alan DeKok" <aland(_at_)freeradius(_dot_)org>
While it's always nice to see some numbers, I'm not sure what
these figures are actually measuring. For instance, yahoo will give a
positive reply for a random mailbox in RCPT TO, delaying rejection until
after DATA. I think the response after data will indicate if the account
doesn't exist or has been (recently) terminated.
Even worse, there is no proven connection between the spam and the
hotmail/yahoo account which is allegedly the sender. The data are
entirely consistent with spammers using lists of verified email
addresses to forge 'From:' lines.
...
That would be make sense only if the number of hotmail/yahoo spam
sender addresses were proportional to the number of hotmail/yahoo
addresses among all targets of spam. Unless you think that most spam
targets are at free providers, you must assume that spammers have some
reason for prefering to send as if from free providers.
Vernon Schryver vjs(_at_)rhyolite(_dot_)com
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