At Changelog: How I volunteered to re-architect Internet email

Excerpt:

SMTP should be blocked on public networks.

Sound crazy? Consider this: Email is now a universal cybercrime portal.
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But email is a foundational Internet application; the concept is too important to let SaaS vendors or social networks define its future. Therefore the open source community must act to replace it, and act now.

So I’ve drafted a protocol, TMTP, and published implementations of both client and server as open source. TMTP is simple, preserving the soul of email, while dramatically reducing its vulnerabilities. It also addresses major user experience gaps in email, which were solved long ago by web-based discussion apps.
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