Email spoofing is a practice used in scams and phishing attacks to deceive people into believing the message came from a known or trusted source.
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Have you ever opened an email from someone you know only to be unsure if it was them who wrote the message?
Whether it seems like a spam email or they asked you a personal question they already know the answer to, it's possible the sender may not be who they appear to be.
How, you ask? The answer is email spoofing.
SPF (Sender Policy Framework): SPF is an email authentication method designed to detect forging sender addresses during the delivery of the email. It allows the owner of a domain to specify which mail servers are authorized to send email on behalf of that domain.
DKIM (DomainKeys Identified Mail): DKIM is another email authentication method that allows the sender to digitally sign an email using a private key. The recipient's email system can then verify the signature using the sender's public key, ensuring the authenticity of the email.
DMARC (Domain-based Message Authentication, Reporting, and Conformance): DMARC builds on SPF and DKIM to provide additional email authentication and policy enforcement capabilities. It allows domain owners to specify what actions to take for emails that fail SPF or DKIM checks, such as quarantine or reject.
DMARC Tags: While not exactly "tags" in the traditional sense, DMARC policies include various tags that specify actions and reporting preferences. These include "p=none" (monitoring mode), "p=quarantine" (emails failing authentication should be treated with suspicion), and "p=reject" (emails failing authentication should be rejected).
Reverse DNS Lookup: This is a technique used to verify that the IP address associated with the sender's domain matches the domain from which the email claims to originate. A mismatch may indicate email spoofing.
Email Authentication Services: Some third-party services offer advanced email authentication features and threat intelligence to help detect and prevent email spoofing attacks.
By implementing these technologies and practices, organizations can reduce the risk of falling victim to email spoofing attacks and enhance the security of their email communications.
