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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SPF is the technology that assures that mail only arrives from authentic senders. One problem remains that slows down its introduction as a hard filter, and that is email forwarding. This article nails the integration of SPF with forwarding.
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Mail is severely hampered by spam, as we all know. Interestingly, some spam prevention tactics are applied so softly that they work against a reliable mail system. Here is a tale from the crypt.
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