GrayHat wrote:
Wow - it's been a few years since I've heard mention of hashcash.
heh :)
Doing a review - hashcash helps (theoretically) with sending.
So it won't decrease the spam volume into an ASSP server
not just sending; if any external sender uses hashcash, ASSP will be
able
to check it and either decrease the spamscore for messages containing
a valid hashcash header or reject messages containing a fake one; so
it may *also* help during the filtering process
The only real benefit I see here is to bypass greylisting - and I think
ASSP already has a number of features in place for this.
The hashcash faq makes the argument that because SpamAssassin
and TMDA have implemented hashcash detection, and SpamAssassin
is widely used - sending with hashcash will improve transmission
efficiency.
but may *also* help incoming mail filtering; if mail comes through an SA
to ASSP and it's tagged with an "x-hashcash" header then ASSP will be
able to treat it as "somewhat less spammish" :D
IF. IF. I just did a search on my mail archive - while I do find a
number of e-mails from Spamassassin senders - 0.00 have hashcash
headers. Granted - that's just me. But I have NONE to evaluate!
I'm not saying hashcash is a terrible idea - I just don't see enough
adoption elsewhere to give a reason for ASSP to use it. I'm not an AOL
user - but as I may have indicated previously I do have to send to AOL,
so items like proper reverse DNS entries are important to me (whether or
not anybody considers reverse DNS to be a valid anti-spam feature is
another discussion - AOL says external senders have to have it, so I
have it). The same for DKIM.
If you could point me to some significant domains that actively use
hashcash, or at least provide some more history, I'd be more
interested. But given the number of discussions on this forum regarding
ASSP hardware requirements, both CPU and RAM - I don't see how including
a module that is explicitly intended to consume maximum resources (for
whatever duration) is a net benefit.
--
Daniel
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