How will BIMI, ARC, and MTA-STS affect future trust scoring?

BIMI, ARC, and MTA-STS will affect future trust scoring by adding new verification layers that complement existing authentication. Senders implementing these standards will build stronger trust profiles than those relying solely on basic SPF, DKIM, and DMARC.

BIMI's visual verification creates user facing trust signals. Displayed brand logos indicate verified identity, potentially influencing engagement rates and subsequent reputation. ARC preserves authentication through forwarding scenarios that currently break DKIM signatures.

MTA-STS ensures encrypted transmission, preventing man in the middle attacks. As these standards mature from optional to expected, lacking them may become negative signals rather than neutral absence. Early adoption builds advantage before enforcement.

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