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According to Live Direct Marketing's daily DNS scan (July 13, 2026), harness.io (Tranco rank #10,909) receives mail via Mimecast and sends through Mandrill, Zendesk, Mimecast. Its DMARC policy is p=reject — one of the minority (47%) of DMARC publishers that actually enforce.
| Mailbox provider (MX) | Mimecast |
|---|---|
| ESPs in SPF | Mandrill, Zendesk, Mimecast, SendGrid (Twilio), Marketo (Adobe) |
| SaaS senders in SPF | none detected |
| DMARC policy | p=reject |
| DMARC record | v=DMARC1; p=reject; rua=mailto:ptdkmfln@ag.us.dmarcian.com; ruf=mailto:ptdkmfln@fr.us.dmarcian.com; |
| Tranco rank | #10,909 |
| Snapshot | 2026-07-13 (updated daily) |
harness.io uses Mimecast for inbound mail (detected from its primary MX record) as of July 13, 2026, per Live Direct Marketing's daily Tranco top-1M scan.
harness.io authorises Mandrill, Zendesk, Mimecast, SendGrid (Twilio), Marketo (Adobe) in its SPF record as of July 13, 2026.
Yes — harness.io publishes p=reject, the strictest DMARC policy (as of July 13, 2026).