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Email infrastructure of guard.io

According to Live Direct Marketing's daily DNS scan (July 13, 2026), guard.io (Tranco rank #3,110) receives mail via Google Workspace and sends through Customer.io, HubSpot. Its DMARC policy is p=reject — one of the minority (47%) of DMARC publishers that actually enforce.

Mailbox provider (MX)Google Workspace
ESPs in SPFCustomer.io, HubSpot
SaaS senders in SPFnone detected
DMARC policyp=reject
DMARC recordv=DMARC1; p=reject; pct=100; rua=mailto:dmarc@guard.io
Tranco rank#3,110
Snapshot2026-07-13 (updated daily)

Frequently asked questions

What email provider does guard.io use?

guard.io 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.

What ESP does guard.io use?

guard.io authorises Customer.io, HubSpot in its SPF record as of July 13, 2026.

Does guard.io enforce DMARC?

Yes — guard.io 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 guard.io at Gmail, Outlook, Yandex and Mail.ru.
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