Mail was designed as a gullable system, and this is generally abused by spammers. Fighting spam is a balancing act between failures to accept and reject. With the more refined identity model of the IdentityHub, we have new tools to strike a better balance.
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OpenPGP is a powerful technology for signing and encryption, because it does not imply a stiffling key infrastructure. Instead, it uses a Web Of Trust that is flexible... and complicating for new users. We now introduce an approach to securely use OpenPGP without even that.
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DKIM is the technology that signs a message and some of its headers at a mail server en route; mostly this is done by the originator of the email. One problem remains that slows down its introduction as a hard filter, and that is email handling that edits the message and then forwards it, as is common for email lists. This article nails the integration of DKIM with forwarding.
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