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According to Live Direct Marketing's daily DNS scan (July 13, 2026), uschamber.com (Tranco rank #10,819) receives mail via Proofpoint and sends through HubSpot, Salesforce, Proofpoint. Its DMARC policy is p=reject — one of the minority (47%) of DMARC publishers that actually enforce.
| Mailbox provider (MX) | Proofpoint |
|---|---|
| ESPs in SPF | HubSpot, Salesforce, Proofpoint, Salesforce Marketing Cloud |
| SaaS senders in SPF | KnowBe4 |
| DMARC policy | p=reject |
| DMARC record | v=DMARC1; p=reject; rua=mailto:postmaster@uschamber.com; ruf=mailto:postmaster@uschamber.com; |
| Tranco rank | #10,819 |
| Snapshot | 2026-07-13 (updated daily) |
uschamber.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.
uschamber.com authorises HubSpot, Salesforce, Proofpoint, Salesforce Marketing Cloud in its SPF record as of July 13, 2026.
Yes — uschamber.com publishes p=reject, the strictest DMARC policy (as of July 13, 2026).