Hm, my previous post on subject seem to have fallen in /dev/null
(can't find it even in list archives, strange).
Anyhow. While on the subject of spam control. I was playing lately
with Domain Key (and also newer Domain Key Identified Mail) systems.
It's currently primarly used by Yahoo and Google Mail (gmail). For
example, all emails from gmail.com on this list have
DomainKey-Signature header. Also, all of those emails fail the
verification. It is most likely due to the mailing list mangling the
Subject line (addtion of [CentOS] tag) and body of the message
(addtion of footer).
Currently, Google uses "in testing flag" in the DNS record (as can be
seen from output of "dig beta._domainkey.gmail.com txt"), so none of
those emails should be rejected by anti-spam software. However, if
they change the flags to instruct anti-spam software to reject emails
with invalid signatures, the emails from this (and many other) mailing
lists will start bouncing big time.
I guess if these systems become widespread in the future, either the
mailing list will need to be updated (so that it regenerates
signatures with its own key, as defined in proposed standards) or
mangling of subject line and the body will have to be abandoned...
Maybe it's a good time to start preparing for the possible future.
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