Email security report card · 2026-11-07
dropbox.com
dropbox.com scores 72/100 (grade C). SPF passes; DKIM signing couldn’t be verified from public DNS alone. Forged mail “from” dropbox.com is refused by the big inboxes. 18 lookalike domains can receive email; none registered recently. The most valuable next step: confirm your DKIM selector.
C72/100
| Area | Check | Status | Points |
|---|---|---|---|
| Authentication | SPF and DKIMSPF passes; DKIM is unverified. SPF: SPF is managed by a dynamic SPF service, which decides per message; we can’t list its senders from DNS alone. DKIM: DKIM wasn’t found under common selector names; with DMARC enforced it very likely exists under a private one. Enter the selector to verify it. | Partly | 20/25 |
| Anti-spoofing | DMARC enforcementMail that fails your checks is refused. | Pass | 30/30 |
| Delivery | Google, Yahoo and Microsoft sender rulesMet if your DKIM signing (not found under common names) is in place. | Partly | 12/15 |
| Encryption | MTA-STSWithout it, an attacker on the network path can downgrade delivery to unencrypted. | Missing | 0/8 |
| Encryption | TLS-RPTAdd a TXT record at _smtp._tls.dropbox.com: v=TLSRPTv1; rua=mailto:tls-reports@dropbox.com | Missing | 0/4 |
| DNS hardening | DNSSECNot signed. Turn on DNSSEC at Amazon Route 53; if the domain is registered elsewhere, add the DS record it gives you at your registrar. | Missing | 0/8 |
| DNS hardening | CAAOnly amazonaws.com, digicert.com, letsencrypt.org may issue certificates. | Pass | 4/4 |
| Brand | BIMI logoLogo and VMC published (issued by DigiCert, Inc., valid until 2027-10-15). Gmail, Apple Mail and Yahoo can show it. | Pass | 6/6 |
What if you fixed…
Today C 72/100
Fix next
- Confirm your DKIM selector
- Turn on MTA-STS
- Turn on DNSSEC
- Turn on TLS-RPT
Exact records and where to click: full check for dropbox.com.
Lookalike exposure
44 registered lookalikes, 18 able to receive email. Not graded: you can’t control who registers them.