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One way to prevent email spoofing is to use an email authentication system, such as SPF, DKIM, or DMARC.
What are SPF, DKIM and DMARC?
SPF is an email validation system that uses a list of IP addresses or hostnames that are authorized to send email on behalf of a domain. When an email is received, the receiving server can check the SPF record of the domain in the email's "From" header to see if the server that sent the email is authorized to do so. If the server is not authorized, the email may be marked as spam or rejected.
DKIM is an email authentication method that uses a digital signature to verify that an email message was actually sent by the domain it claims to be sent from. The digital signature is added to the email's header and can be checked by the receiving server to verify the authenticity of the message.
DMARC is an email authentication system that allows the owner of a domain to publish a policy in their DNS records specifying which mechanisms (such as SPF or DKIM) are used to authenticate email sent from their domain. Receiving servers can check the DMARC policy of a domain to determine how to handle incoming email that fails SPF or DKIM checks.
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