cscdns.net vs Fastmail

Fastmail is used by more websites in our catalog: 351 use cscdns.net and 1,580 use Fastmail.

Fastmail sites have the higher median Ahrefs Domain Rating (cscdns.net: 35, Fastmail: 38).

Between 2026-06 and 2026-07, cscdns.net went from 0.05% to 0.04% of all tracked sites, while Fastmail went from 0.22% to 0.18%. cscdns.net is gaining ground faster in our index.

No. A site runs a single email host, so cscdns.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.