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According to Live Direct Marketing's daily DNS scan (July 13, 2026), udacity.com (Tranco rank #10,644) receives mail via Proofpoint and sends through Salesforce, HubSpot, Zendesk. Its DMARC policy is p=reject — one of the minority (47%) of DMARC publishers that actually enforce.
| Mailbox provider (MX) | Proofpoint |
|---|---|
| ESPs in SPF | Salesforce, HubSpot, Zendesk, SendGrid (Twilio), Marketo (Adobe) |
| SaaS senders in SPF | none detected |
| DMARC policy | p=reject |
| DMARC record | v=DMARC1;p=reject;fo=1;rua=mailto:dmarc_rua@emaildefense.proofpoint.com;ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com |
| Tranco rank | #10,644 |
| Snapshot | 2026-07-13 (updated daily) |
udacity.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.
udacity.com authorises Salesforce, HubSpot, Zendesk, SendGrid (Twilio), Marketo (Adobe) in its SPF record as of July 13, 2026.
Yes — udacity.com publishes p=reject, the strictest DMARC policy (as of July 13, 2026).