On 2012-11-01, Jan Stary <h...@stare.cz> wrote: > Anyway, it seems (some) spambots got less demented and actually do > resend, getting themselves whitelisted - thus working themselves > around the whole premise of greylisting.
Not the whole premise... A good part of it is to just delay the mail, this increases the chance that spamtraps etc will have picked up the mail before you accept it, thus increasing the effectiveness of other checks (DNSBL, razor/pyzor, etc).
