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FAQ
Warum werden E-Mails bei Web.de und GMX abgelehnt?
Welchen SPF-Eintrag muss ich in meiner DNS-Zone eintragen?
Wie richte ich ein Whitelisting zur Absendervalidierung ein? (DKIM-, SPF- oder DMARC-Fail)
Was ist CNAME?
Wie richte ich DKIM ein?
Was ist SPF?
Was ist DKIM?