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According to Live Direct Marketing's daily DNS scan (July 12, 2026), hbr.org (Tranco rank #775) receives mail via Proofpoint and sends through Sailthru, Amazon SES, SendGrid (Twilio). Its DMARC policy is p=reject — one of the minority (47%) of DMARC publishers that actually enforce.
| Mailbox provider (MX) | Proofpoint |
|---|---|
| ESPs in SPF | Sailthru, Amazon SES, SendGrid (Twilio) |
| SaaS senders in SPF | BigCommerce |
| DMARC policy | p=reject |
| DMARC record | v=DMARC1; p=reject; pct=100; rua=mailto:ufwln6jz@ag.dmarcian.com; ruf=mailto:ufwln6jz@fr.dmarcian.com |
| Tranco rank | #775 |
| Snapshot | 2026-07-12 (updated daily) |
hbr.org uses Proofpoint for inbound mail (detected from its primary MX record) as of July 12, 2026, per Live Direct Marketing's daily Tranco top-1M scan.
hbr.org authorises Sailthru, Amazon SES, SendGrid (Twilio) in its SPF record as of July 12, 2026.
Yes — hbr.org publishes p=reject, the strictest DMARC policy (as of July 12, 2026).