On Jun 17, 2007, at 3:43 PM, Meng Weng Wong wrote:
bleak. Sender authentication requires substantial effort.
I don't see people (myself included) putting in that effort if
a handful of easily configured high-quality DNSBLs block 99.9%
of the spam.
And you're right that DNSBL quality has improved significantly.
Spamhaus are doing a fantastic job. There's an impressive amount
of coverage out there. Interestingly, though, there is also less
overlap than one might expect.
Oh, and by the way, from what I've seen of the backchannels in the
DNSBL world where folks decide which IP ranges go get blacklisted,
SPF records are often very useful: many spammers publish them, and it
makes the DNSBL maintainer's job a whole lot simpler when they do.
So SPF is, in some way, actually contributing to the quality of
DNSBLs that you're witnessing. In a way they are just doing what
you're doing ahead of time.
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