hi all, this is a list of useful online checks for websites, emails, dns and server we have a broad range from performance to security
Internet.nl is an initiative of the Internet community and the Dutch government https://en.internet.nl/ security at its best https://www.hardenize.com/ https://dnsspy.io/scan/
https://tools.keycdn.com/http2-test
https://www.giftofspeed.com/gzip-test/
https://geekflare.com/de/smtp-testing-tools/ https://tls.imirhil.fr/
https://de.ssl-tools.net/mailservers https://www.secumail.de/mailserveranalyse/ https://www.emailsecuritygrader.com
http://multirbl.valli.org/lookup/ https://spameatingmonkey.com/lookup
https://talosintelligence.com/
https://www.ultratools.com/tools/dnsLookup https://dnschecker.org/ https://www.experte.de/dns-check https://toolbox.googleapps.com/apps/dig/#ANY/
https://us.dmarcian.com/xml-to-human-converter/