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According to Live Direct Marketing's daily DNS scan (July 13, 2026), lum-sdk.io (Tranco rank #11,928) sends through Zendesk. Its DMARC policy is p=reject — one of the minority (47%) of DMARC publishers that actually enforce.
| Mailbox provider (MX) | no MX / not classified |
|---|---|
| ESPs in SPF | Zendesk |
| SaaS senders in SPF | none detected |
| DMARC policy | p=reject |
| DMARC record | v=DMARC1; p=reject; rua=mailto:dmarc_rua@brightdata.com |
| Tranco rank | #11,928 |
| Snapshot | 2026-07-13 (updated daily) |
lum-sdk.io has no classifiable MX record as of July 13, 2026, per Live Direct Marketing's daily Tranco top-1M scan.
lum-sdk.io authorises Zendesk in its SPF record as of July 13, 2026.
Yes — lum-sdk.io publishes p=reject, the strictest DMARC policy (as of July 13, 2026).