Cristobal Palmer wrote:
You have a better suggestion?
Greylisting? Nolisting? CAPTCHA? Something else?
OpenBSD's spamd is one of the most brilliant ideas going. The best
adaptation spammers have made to deal with it is simply to recognize it
and disconnect before the spam engine gets stuck.
I've had mixed results with greylisting. The problem is that some ISP's
and corporations have a pool of outbound smtp servers that will retry
from different hosts, so you may not get the same tuple on the retry and
the mail is delayed again and again and again until it is eventually
timed out.
Anything that requires a sender to send a mail and then *do something
else* (be it a CAPTCHA or a response or whatever) is going to be
aggravating as hell and result in one of the most undesirable
conditions: loss of legitimate mail.
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