arsmtp.com vs Fastmail

arsmtp.com is used by more websites in our catalog: 2,813 use arsmtp.com and 1,580 use Fastmail.

Fastmail sites have the higher median Ahrefs Domain Rating (arsmtp.com: 30, Fastmail: 38).

Between 2026-06 and 2026-07, arsmtp.com went from 0.34% to 0.32% of all tracked sites, while Fastmail went from 0.22% to 0.18%. arsmtp.com is gaining ground faster in our index.

No. A site runs a single email host, so arsmtp.com 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.