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According to Live Direct Marketing's daily DNS scan (July 13, 2026), isc.org (Tranco rank #3,347) receives mail via Self-Hosted and sends through Mailchimp, Salesforce. Its DMARC policy is p=none (monitor only) — like the majority of DMARC publishers (53% don't enforce).
| Mailbox provider (MX) | Self-Hosted |
|---|---|
| ESPs in SPF | Mailchimp, Salesforce |
| SaaS senders in SPF | Shopify |
| DMARC policy | p=none |
| DMARC record | v=DMARC1; p=none; sp=reject; rua=mailto:0rzssdyk@ag.dmarcian.com; ruf=mailto:0rzssdyk@fr.dmarcian.com, mailto:dmarcforensic@isc.org; fo=1; |
| Tranco rank | #3,347 |
| Snapshot | 2026-07-13 (updated daily) |
isc.org uses Self-Hosted for inbound mail (detected from its primary MX record) as of July 13, 2026, per Live Direct Marketing's daily Tranco top-1M scan.
isc.org authorises Mailchimp, Salesforce in its SPF record as of July 13, 2026.
No — isc.org publishes p=none, which only monitors and does not block spoofing (as of July 13, 2026).