[anti-abuse-wg] Thunderbird automatic SPAM reporting to ISP

Hello,

I would like to develop a SPAM fighting extension of the Thunderbird 
email client.

On the contrary of existing plugins, this new plugin would allow each 
end-user to report SPAM directly to the right ISP instead of delegating 
it to a centralized service. This solution distributes the cost between 
all the spam reporters.

For that, I need to know which ISP hosts a given IP.

Of course, I can write a wrapper of the http://www.db.ripe.net/whois 
portal. However I'm searching a more efficient way. For example, we 
could use a compressed database file on ripe.net (or on bittorrent 
network) and local caching on each email client.

I would like to discuss this with the list and provide the most 
efficient solution for everyone.

Thanks for your advise.

Regards.