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I believe people have talked about something similar, namely requiring cryptographic operations which are relatively cheap (time, electricity cost) to do for on
by gknoy 13y ago
I believe people have talked about something similar, namely requiring cryptographic operations which are relatively cheap (time, electricity cost) to do for one email at a time, but which would make it infeasible for bulk mailing spam.
- dllthomas 13y agoPeople have also proposed it with money; I believe the overhead has consistently been too high.
- claudius 13y agoOnly accepting encrypted email would be a start, I guess – at the very least, the sender has to know the ~1 kB for the public key and he also has to encrypt every email individually.
- 9ac345a5509a 13y agoOne such system is Hashcash [0], there is an extension for Thunderbird [1] which uses it. The only thing is that legitimate mass emails (think mailing lists) will be delayed as well, unless some sort of exception is added. [0] http://en.wikipedia.org/wiki/Hashcash [1] http://pennypost.sourceforge.net/PennyPost
- fryguy 13y agoI think the standard solution for the mailing lists is the "subscription" email pays the hashcash, but has an automated way to whitelist the email upon receipt.