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Email infrastructure of opendns.com

According to Live Direct Marketing's daily DNS scan (July 12, 2026), opendns.com (Tranco rank #363) receives mail via Cisco IronPort and sends through Zendesk, Amazon SES. Its DMARC policy is p=none (monitor only) — like the majority of DMARC publishers (53% don't enforce).

Mailbox provider (MX)Cisco IronPort
ESPs in SPFZendesk, Amazon SES
SaaS senders in SPFnone detected
DMARC policyp=none
DMARC recordv=DMARC1; p=none; rua=mailto:hostmaster@opendns.com
Tranco rank#363
Snapshot2026-07-12 (updated daily)

Frequently asked questions

What email provider does opendns.com use?

opendns.com uses Cisco IronPort for inbound mail (detected from its primary MX record) as of July 12, 2026, per Live Direct Marketing's daily Tranco top-1M scan.

What ESP does opendns.com use?

opendns.com authorises Zendesk, Amazon SES in its SPF record as of July 12, 2026.

Does opendns.com enforce DMARC?

No — opendns.com publishes p=none, which only monitors and does not block spoofing (as of July 12, 2026).

DNS records say who should deliver your mail — they don't say whether it lands in the inbox. Run a free inbox placement test for opendns.com at Gmail, Outlook, Yandex and Mail.ru.
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