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According to Live Direct Marketing's daily DNS scan (July 13, 2026), hackmd.io (Tranco rank #10,752) receives mail via Google Workspace and sends through Mailchimp, Mailgun, Zendesk. Its DMARC policy is p=reject — one of the minority (47%) of DMARC publishers that actually enforce.
| Mailbox provider (MX) | Google Workspace |
|---|---|
| ESPs in SPF | Mailchimp, Mailgun, Zendesk, Amazon SES |
| SaaS senders in SPF | none detected |
| DMARC policy | p=reject |
| DMARC record | v=DMARC1;p=reject;pct=100;rua=mailto:dmarc@hackmd.io |
| Tranco rank | #10,752 |
| Snapshot | 2026-07-13 (updated daily) |
hackmd.io uses Google Workspace for inbound mail (detected from its primary MX record) as of July 13, 2026, per Live Direct Marketing's daily Tranco top-1M scan.
hackmd.io authorises Mailchimp, Mailgun, Zendesk, Amazon SES in its SPF record as of July 13, 2026.
Yes — hackmd.io publishes p=reject, the strictest DMARC policy (as of July 13, 2026).