Would a hashcash plugin do the stamping as a background task, transparently? - Or do we need to invoke a dialog and make it foreground? (imo hashcash stamping should be as transparent as possible, in fact the only thing the user should see is a checkbox on the thunderbird preferences screen to enable it, and perhaps a 'number of bits' textbox value) Anyway, here are a couple of links; http://www.unsignedbyte.com/?page_id=4 Here's one called the 'send later' extension, it allows you to schedule outgoing emails to be sent later. I think it's relevant as it uses a method of moving the email to drafts, then monitors the drafts folder until a certain time, and then moves it to outbox. http://stackoverflow.com/questions/162057/how-do-you-insert-email-headers-with-a-thunderbird-extension Uses js to intercept the outgoing email and insert headers. Regards, John. On 30 June 2011 15:10, Eric S. Johansson <esj@xxxxxxxxxx> wrote: > http://sourceforge.net/apps/**mediawiki/attachreminder/** > index.php?title=Main_Page<http://sourceforge.net/apps/mediawiki/attachreminder/index.php?title=Main_Page> > > it seems to me that we could repurpose this plug-in as a way of adding > proof of work stamps. One potential problem might be the time it takes to > generate stamps and how long we get in the user's way. > > Have folks seen better Thunderbird plug-ins we could repurpose? > >