mail-resource-proxy.mail.notion.so

About certificate history for mail-resource-proxy.mail.notion.so

This page lists every X.509 (SSL/TLS) certificate ever issued for mail-resource-proxy.mail.notion.so and its subdomains, as recorded in public Certificate Transparency (CT) logs. CT logs are an immutable, append-only record of every certificate issued by participating Certificate Authorities (CAs), as required by the major browsers since 2018.

Subdomain enumeration via CT logs is one of the highest-signal techniques in reconnaissance — every time a TLS certificate is issued, all Subject Alternative Names (SANs) on that certificate become public. Internal and forgotten subdomains regularly show up here days after they're set up.

To monitor mail-resource-proxy.mail.notion.so for newly-issued certificates in real-time (useful for detecting unauthorized issuance, phishing variants, or shadow IT) add it to your watchlist (Pro plan).