Hier sind einige Tools, die du verwenden kannst, um die DNS-Einrichtung zu testen (einschließlich SMTP-Banner, DKIM, DMARC usw.):

MX Toolbox (DNS, SMTP, RBL) 

port25.com (DKIM, SPF) 

Mail-tester (DKIM, DMARC, SPF) 

DMARC Analyzer (DMARC, SPF) 

MultiRBL.valli.org (DNSBL, RBL, FCrDNS) 

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