Penny Post is a system to combat spam emails by making the sender "pay for email" by spending a few seconds of computing time. Outgoing mail is marked with postage stamps that convince the receiver that the sender is genuine.
License
GNU Library or Lesser General Public License version 2.0 (LGPLv2), GNU General Public License version 2.0 (GPLv2)Follow Penny Post
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User Reviews
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It really works! Please begin develop this Add-on again!