Update README.md
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@ -9,3 +9,4 @@ Information about how to configure email servers, services, etc.
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- https://dnssec-debugger.verisignlabs.com/
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- https://www.experte.de/dns-check/dnssec
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- https://ssl-tools.net/
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- https://www.nospamproxy.de/wp-content/uploads/Praxisleitfaden-DKIM-SPF-DMARC-DANE-1.pdf
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