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spam detection email filters unwanted messages phishing attempts cybersecurity measures prevention junk mail control online threats malicious security filtering cyber hygiene unsubscribe options scam awareness suspicious links fraudulent emails reports authentication digital safety protection laws anti-spam spoofing malware defense threat landscape protocols compliance schemes spoofed identities attack trends verification data privacy headers internet resilience spoof attachments intelligence safe browsing tips practices anti-phishing tools reporting activity trustworthiness legislation fraud