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According to Live Direct Marketing's daily DNS scan (July 13, 2026), dropbox.com (Tranco rank #129) receives mail via Proofpoint and sends through Zendesk, Amazon SES, Marketo (Adobe). Its DMARC policy is p=reject — one of the minority (47%) of DMARC publishers that actually enforce.
| Mailbox provider (MX) | Proofpoint |
|---|---|
| ESPs in SPF | Zendesk, Amazon SES, Marketo (Adobe) |
| SaaS senders in SPF | Oracle Cloud Email |
| DMARC policy | p=reject |
| DMARC record | v=DMARC1;p=reject;pct=100;rua=mailto:c7xrs-8253@rua.dmarc.emailanalyst.com,mailto:dmarc@dropbox.com |
| Tranco rank | #129 |
| Snapshot | 2026-07-13 (updated daily) |
dropbox.com uses Proofpoint for inbound mail (detected from its primary MX record) as of July 13, 2026, per Live Direct Marketing's daily Tranco top-1M scan.
dropbox.com authorises Zendesk, Amazon SES, Marketo (Adobe) in its SPF record as of July 13, 2026.
Yes — dropbox.com publishes p=reject, the strictest DMARC policy (as of July 13, 2026).