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SPF, DKIM, and DMARC are different e-mail authentication methods that aim to increase security in e-mail traffic and impede phishing and potential identity theft.

SPF determines which mail servers or IP addresses can send e-mails with a domain. Upon receipt of an e-mail, the recipient’s server accesses the DNS zone of the sender domain. In doing so, it compares whether the sender’s server matches the details in the SPF record. This article discusses SPF in more detail.

DKIM adds a digital signature to e-mails. The recipient’s server can verify this signature with a public key stored in the DNS zone of the sender domain. As a result, the recipient can be sure that the e-mail content is unchanged and that the e-mail originates from a authorized sender. DKIM therefore supplements SPF. This article discusses DKIM in more detail.

When using DMARC, a domain owner can define how e-mails should be handled that come from their domain and do not pass the SPF or DKIM check. DMARC therefore requires valid SPF and DKIM records. A “DMARC policy” defines whether e-mails that do not pass the check should be rejected, moved to the spam folder, or delivered normally. This article discusses DMARC in more detail.

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