Scott Kitterman wrote:
This one isn't free, but maybe something like this would help:
http://www.support-intelligence.com/dob/
Given that Stuart wrote:
Each freshly registered domain has a valid and reasonable SPF record.
All identical - usually "v=spf1 a -all", and all such spam is SPF pass.
SPF-wise, to block domains that are newer than 5 days looks like the
perfect answer. However, I still don't know why spammers stop using
domains after a few days. I recall finding that spammers domain had
been shut down within a few days; however, that was from manual
lookups so I have no statistically relevant data. Is that due to
individual providers' initiative, possibly driven by users'
complaints, or are there some more structured mechanisms that operate
within those 5 days?
--
TIA
Ale
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