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.