Providers/Proton Pass aliases
Proton Pass aliases
Proton Pass hide-my-email style aliases forward mail through Proton’s relay infrastructure.
Proton aliases often belong to privacy-focused real users. Use the relay signal with velocity and IP context rather than blocking by default.
Example domains
Public domains commonly associated with Proton Pass aliases. ShieldSignup coverage is broader (marketing: 94,000+ disposable domains) — this page lists examples only, not every domain the provider may use.
- passfwd.com
Block with ShieldSignup
Call POST /v1/assess with the signup email. For known domains of this type, expect reason code email_relay and signals.email.relay_domain: true.
curl -sS -X POST https://www.shieldsignup.com/v1/assess \
-H "Authorization: Bearer sk_live_…" \
-H "Content-Type: application/json" \
-d '{"email":"user@passfwd.com","ip":"203.0.113.10"}'Related providers
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AnonAddy
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DuckDuckGo Email Protection
DuckDuckGo Email Protection issues @duck.com aliases that forward to a private address.