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Email Security
Email Security
Email Security
Email Security
Email Security
Email Security
Email Security
Email Security
Email Security
Email Security
Email Security
Introduction
Email remains the primary attack vector for most organizations. Phishing, business email compromise (BEC), and spam represent significant risks. A robust email security strategy combines authentication protocols, gateway filtering, and user awareness training.
SPF, DKIM, and DMARC
These three DNS-based authentication protocols work together to verify email sender legitimacy and prevent domain spoofing.
SPF (Sender Policy Framework)
SPF specifies which mail servers are authorized to send email for a domain via DNS TXT records.
example.com. TXT "v=spf1 ip4:203.0.113.0/24 include:_spf.google.com ~all"
Mechanisms: ip4 , ip6 , include , a , mx , exists .…
