Sorry for the delay getting back to you; copying some Thunderbird mavens here. ----- Original Message ----- > I wonder if we could get somewhere by asking on thunderbird-dev list. > > Mike do you know anyone with an interest in anti-spam, hashcash types > of things from thunderbird side of mozilla? > > We want to wrap up this ages old bug mentioned below that has been > bouncing around for ages and actually implement something! We can do > the hashcash > library part we lack thunderbird programming experience. > > btw something that may help the attractiveness is if hashcash library > supports also the microsoft hashcash spec  - its free to use and I > think open source compatible even unusually for anything microsoft > related. > > While they basically adaopted hashcash the serialization is > incompatible. I'll volunteer to code that spec and add it to hashcash. > > hashcash already has both a library (libhashcash.a/hashcash.dll and a > command line tool and an example program using the library - > example.c) (Note you want to get the pre-release if you want to try > the example.c it > suffered bit rot I noticed). > > Adam > >  > http://download.microsoft.com/download/5/d/d/5dd33fdf-91f5-496d-9884-0a0b0ee698bb/%5BMS-OXPSVAL%5D.pdf > > On Thu, Mar 31, 2011 at 03:20:43PM +0200, Bas Steendijk wrote: > >in the feature request to add hashcash in mozilla thunderbird, > > > >https://bugzilla.mozilla.org/show_bug.cgi?id=229686 > > > >which currently has status "WONTFIX", after i countered the arguments > >that caused it to get that status, the following happened: > > > >i gave argument: > > > >"this request is not about adding the 16 MB library, but about adding > >hashcash, which is simple and can be implemented in little size." > > > >Ludovic Hirlimann then posted: > > > >"Please provide a patch so we can figure out how much this would add > >and then decide if we want it in the product or not." > > > >i'm asking hereby if someone can produce a patch to add hashcash to > >thunderbird, and post on there.