Maluc:
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maybe i misread, but what i got from it is that he wants to keep only a whitelist of valid email addresses that can send emails to him.. which can already be done manually in many email providers filters section. This solution won't work for everybody though. If its your primary work one and you email many clients or strangers.. expect some non-delivered replies from them :/
Totally block all mail, send a reply message where they can sign for a key, when they got a key, it's is macthed against his/her e-mail, so next time they can e-mail me forever until i "flag" their key false again in my admin. :)
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It will indeed cut down on the spam you receive, significantly. but also makes you much harder for friends/clients to contact. But i agree it would be nice as an option.. instant message programs all already have this optional whitelist feature - email providers should consider it.
Yes, but a onetime key request, doesn't seem to much of a fuss i guess. If they really wanna mail me, they can do that also for one time only.
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By the way though, like most security-thru-obscurity ideas, spammers will get around it should it catch on. Since this is the email equivalent to a referrer check + cookie check
Not quite, the email is being send to the "keymaker" or "maintainer" like: mynewemail@keymaker.com, and by default everything is blocked, until i log into it and flag the e-mails who may send me mail.
That's about it of my idea.