Switch to Protonmail Reason #33: Detect tampering with supported signed contact information

Changing a stored contact detail could redirect a private message or call toward an attacker.

Why this matters

Changing a stored contact detail could redirect a private message or call toward an attacker. Privacy is easier to defend before this information is collected than after it has spread.

The protection

Proton supports digital signatures for certain contact details to help detect alteration.

Take action

Review unexpected contact changes before acting on them. Verify critical contact information independently. Email protection depends on the route and settings. Ordinary mail involving outside providers is not automatically end-to-end encrypted, and email metadata is not universally hidden.

Sources

Proton Mail security checklist.