Email Hosting Providers

SPFSPF

SPF Usage Statistics · Download List of All Websites using SPF

The Sender Policy Framework is an open standard specifying a technical method to prevent sender address forgery.

Web Servers

CaddyCaddy

Caddy Usage Statistics · Download List of All Websites using Caddy

Caddy is a modern HTTP/2 webserver, with built-in Let's Encrypt support.