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by e12e
3433 days ago
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I remember having a server side system for generating cryptographic email aliases along the lines of: base64encode(hmac("new-sender@example.com+valid-to+01012018", key))+user@mydomain.com Truncated to something like fvv544+user@mydomain.com that would only be valid when sent with the from-adress new-sender@example.com (along with some clever magic to avoid email loops! :-) I think maybe it was authored by ESR (Eric Raymond) in python - but Google only turns up various dkim schemes... New senders would have their mail held back, and get a "please reply if you are human"-message - a reply (to the "magic" reply-to alias) would release the held mail and whitelist the sender. A greylist variant of sorts. |
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