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After some finetuning of this blog it is time for a break and to check the current state objectively.
Yes, quality is measurable - these online tests give you a quick overview where you stand:

• Google Lighthouse
• Mozilla Observatory
• SSL Labs Servertest
• Webbkoll
• Hardenize
• DNSViz

The results are quite impressive. Everything’s shipshape.

Postscriptum from October, 18th 2020:

I’ve added Hardennize and DNSViz to the list. Hardenize offers wonderful birs-eye view for Web+Email, DNSViz due to the fact that its checking the DNS.