On Thu 24/Jan/2013 13:08:21 +0100 Sam Varshavchik wrote:
>
> Just looking at the results of trying to meta-program the DNSBL lookup
> logic in couriertcpd, using pcre, doesn't look right to me. PCRE in
> couriertcpd would be ok, it's just all the rest of it looks overly
> complicated.
Yeah, it reminds me of Apache's mod_rewrite, somewhat. I guess regex
programming tends to produce such kind of intricacies.
> Looking at what dnswl.org is doing, probably the best thing to do
> there is not to use BLOCK in conjunction with other DNSBLs, and just
> have a generic setting that records environment variables, and leave
> it up to a custom global mail filtering module to process all the
> lookups and figure out what to do with them.
>
> And, looking at what dnswl.org, I have a healthy dose of skepticism
> about them, anyway.
IME, it's good for SPF: Instead of ?all, one can end an SPF record
with ?exists:%{ir}.list.dnswl.org -all. The latter brings much the
same gain as the former, without being overly permissive. After all,
dnswl.org delivers a domain name, whose abuse team can be targeted.
Given what SPF is, the cost of delaying those rejections until the end
of data, so as to let the global filter handle them, seems to be
acceptable.
It would have been different if spamhausewhitelist had had a success
comparable to that of their BLs. But the lack of participation in
this thread --except for your polite replies-- is itself a gauge of
the apathy that characterizes this subject.
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