Mimecast vs opalstack.com

Mimecast is used by more websites in our catalog: 11,342 use Mimecast and 112 use opalstack.com.

Mimecast sites have the higher median Ahrefs Domain Rating (Mimecast: 51, opalstack.com: 27).

Between 2026-06 and 2026-07, Mimecast went from 1.6% to 1.3% of all tracked sites, while opalstack.com went from 0.02% to 0.01%. opalstack.com is gaining ground faster in our index.

No. A site runs a single email host, so Mimecast and opalstack.com 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.