Fastmail vs mailbox.org

Fastmail is used by more websites in our catalog: 1,580 use Fastmail and 133 use mailbox.org.

mailbox.org sites have the higher median Ahrefs Domain Rating (Fastmail: 38, mailbox.org: 47).

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

No. A site runs a single email host, so Fastmail and mailbox.org 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.