Defaults.Exposed › Stats › Email authentication (SPF, DKIM, DMARC)
What percent of domains have DKIM?
As of July 28, 2026 · census snapshot 2026-07-28
As of July 28, 2026, 51.2% of the 74 million domains graded in the Defaults.Exposed census have a discoverable DKIM selector — 37,762,161 domains.
DKIM selectors are only discoverable by probing common selector names; domains using non-standard selectors may be undercounted.
Cite this
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, "What percent of domains have DKIM?" (as of July 28, 2026). https://defaults.exposed/stats/what-percent-of-domains-have-dkim
Permalink:https://defaults.exposed/stats/what-percent-of-domains-have-dkim · Machine-readable:dkim-adoption.json · Licence:open data
Methodology: how we grade the internet · Source data: defaults.exposed/data. Updated with each census edition.