Whitelist/verification spam filters
marklists at mceahern.com
Wed Aug 28 06:10:56 CEST 2002
> The appeal, to me, of the whitelist technique is that for the addresses in
> my whitelist, there will be no false positives.
> Not entirely true if I understand what you mean. Among other problems,
> SMTP has no authentication standard. If you are using a typical server,
> somebody can connect and say they are sending mail from <whitelisteduser>
> when in fact they are not.
I thought that false positive in the context of spam filtering means
something is falsely classified as spam. So, by definition, the very narrow
scenario I described (someone is one your whitelist and they get classified
as spam) simply cannot happen.
The scenario you point out--someone masquerading as a member of your
whitelist in order to send you spam--is certainly a valid scenario. I guess
I'd call that a false negative.
Of course, I'd be delighted if someone could correct my reading of these
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