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According to Live Direct Marketing's daily DNS scan (July 13, 2026), slack.com (Tranco rank #323) receives mail via Google Workspace and sends through 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 | Zendesk |
| SaaS senders in SPF | Slack, Qualtrics |
| DMARC policy | p=reject |
| DMARC record | v=DMARC1;p=reject;fo=1:d:s;pct=100;rua=mailto:dmarc_agg@vali.email,mailto:0e5a5c34@inbox.ondmarc.com;ruf=mailto:0e5a5c34@inbox.ondmarc.com |
| Tranco rank | #323 |
| Snapshot | 2026-07-13 (updated daily) |
slack.com 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.
slack.com authorises Zendesk in its SPF record as of July 13, 2026.
Yes — slack.com publishes p=reject, the strictest DMARC policy (as of July 13, 2026).