https://www.diginterface.com/ 1.0 https://www.diginterface.com/blacklist-checker 0.8 https://www.diginterface.com/whois 0.8 https://www.diginterface.com/spf-macro-tester 0.8 https://www.diginterface.com/email-header-analysis 0.8 https://www.diginterface.com/about 0.5 https://www.diginterface.com/faq 0.5