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Check the DMARC policy and email authentication configuration for t-online.de. DMARC protects against email spoofing and phishing attacks.
DMARC (Domain-based Message Authentication, Reporting & Conformance) is an email authentication protocol published as a DNS TXT record at _dmarc.t-online.de. It tells receiving mail servers how to handle emails that fail SPF or DKIM authentication checks. A properly configured DMARC record for t-online.de prevents attackers from sending spoofed emails that appear to come from t-online.de, protecting the domain's reputation and its users from phishing attacks. Google and Yahoo now require DMARC for bulk email senders.