[hashcash] Re: SpamAssassin / hashcash deployment stats?

Adam Back wrote:
Well I did put some thought to site wide use of hashcash cmd line tool
... 
domain name (or it doesn't hurt to make this assumption).  Of course
large ISPs with many soft hosted email accounts, they'll be using lots
of MX records pointing at the same host.  Unfortunately I don't think
there is a reverse lookup on MX records to find which MX domains this
IP serves.

for the static *@blah.tld, use a site specific configuration file to eliminate ambiguities like the bar.foo.com and bar.co.uk cases. just spell them out in a file and then convert to a dbm file ala newaliases. cheap and easy. speed up later

otherwise, the querying entity would supply the entire email address and no special lookup is needed. I would match from most specific to least.

would you want a quality of match indicator? exact, partial (and which), or none?



Is there an SMTP query command to ask an SMTP server what it accepts?

vrfy but it is turned off most of the time. I've considered playing with turning it on in postfix to bounce "no such user" messages in the camram prefilter.

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