cf-emailsecurity.net vs Fastmail

Fastmail is used by more websites in our catalog: 127 use cf-emailsecurity.net and 1,580 use Fastmail.

cf-emailsecurity.net sites have the higher median Ahrefs Domain Rating (cf-emailsecurity.net: 59, Fastmail: 38).

Between 2026-06 and 2026-07, cf-emailsecurity.net went from 0.02% to 0.01% of all tracked sites, while Fastmail went from 0.22% to 0.18%. cf-emailsecurity.net is gaining ground faster in our index.

No. A site runs a single email host, so cf-emailsecurity.net and Fastmail are mutually exclusive.

Adoption is counted from Site Stats Database's own crawl; Domain Rating comes from Ahrefs and traffic from DataForSEO. Figures reflect the sites we track and refresh at least monthly.