Defaults.Exposed › Stats › Email authentication (SPF, DKIM, DMARC)
How many mail-receiving domains lack email authentication?
As of July 28, 2026 · census snapshot 2026-07-28
As of July 28, 2026, 27,539,878 domains that resolve mail exchangers publish neither SPF nor DMARC — 10.0% of all graded domains receive email with no authentication published.
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Statistic current as of July 28, 2026. Recomputed from the live census each edition; the number on this page and the machine-readable twin always match. Please cite Defaults.Exposed and link this page.
Defaults.Exposed, "How many mail-receiving domains lack email authentication?" (as of July 28, 2026). https://defaults.exposed/stats/how-many-mail-domains-lack-authentication
Permalink:https://defaults.exposed/stats/how-many-mail-domains-lack-authentication · Machine-readable:mx-no-auth.json · Licence:open data
Methodology: how we grade the internet · Source data: defaults.exposed/data. Updated with each census edition.