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Email infrastructure of duosecurity.com

According to Live Direct Marketing's daily DNS scan (July 13, 2026), duosecurity.com (Tranco rank #3,246) receives mail via Cisco IronPort and sends through Zendesk, Marketo (Adobe). Its DMARC policy is p=reject — one of the minority (47%) of DMARC publishers that actually enforce.

Mailbox provider (MX)Cisco IronPort
ESPs in SPFZendesk, Marketo (Adobe)
SaaS senders in SPFDuo Security (Cisco)
DMARC policyp=reject
DMARC recordv=DMARC1; p=reject; sp=reject; adkim=r; aspf=r; fo=1; rf=afrf; pct=100; ri=86400; ruf=mailto:thknwdkw@fr.dmarcian.com; rua=mailto:thknwdkw@ag.dmarcian.com
Tranco rank#3,246
Snapshot2026-07-13 (updated daily)

Frequently asked questions

What email provider does duosecurity.com use?

duosecurity.com uses Cisco IronPort for inbound mail (detected from its primary MX record) as of July 13, 2026, per Live Direct Marketing's daily Tranco top-1M scan.

What ESP does duosecurity.com use?

duosecurity.com authorises Zendesk, Marketo (Adobe) in its SPF record as of July 13, 2026.

Does duosecurity.com enforce DMARC?

Yes — duosecurity.com publishes p=reject, the strictest DMARC policy (as of July 13, 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 duosecurity.com at Gmail, Outlook, Yandex and Mail.ru.
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