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Check the DMARC policy and email authentication configuration for qq.com. 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.qq.com. It tells receiving mail servers how to handle emails that fail SPF or DKIM authentication checks. A properly configured DMARC record for qq.com prevents attackers from sending spoofed emails that appear to come from qq.com, protecting the domain's reputation and its users from phishing attacks. Google and Yahoo now require DMARC for bulk email senders.