Email Security
BIMI
BIMI lets a domain declare a brand-logo location for supported inboxes, but this lookup only checks the DNS record and DMARC posture. It does not fetch the logo, verify evidence documents, or prove mailbox-provider display.
SMTP STARTTLS
STARTTLS is negotiated during a live SMTP session after EHLO. This DNS-only lookup does not connect to MX hosts, complete a TLS handshake, or validate SMTP certificates. MTA-STS and TLS-RPT can improve transport policy and reporting, but they do not prove that a specific MX currently accepts STARTTLS.
MTA-STS
MTA-STS publishes a HTTPS policy for mail delivery TLS expectations. This lookup checks the DNS record and policy file, but it does not perform a live SMTP delivery or prove that every MX currently negotiates TLS.
TLS-RPT
TLS-RPT publishes where mail systems can report TLS delivery problems. It is a reporting record, not a live SMTP TLS or certificate validation result.