Thursday, March 6, 2025

SPF, DKIM, and DMARC

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SPF, DKIM, and DMARC are DNS records that verify the identity of an email sender. They are used to prevent email spoofing and phishing. 

How they work

SPF: Lists IP addresses that are authorized to send email on behalf of a domain 

DKIM: Uses an encrypted key pair to add a digital signature to each email 

DMARC: Specifies policies to apply to emails that fail to authenticate with SPF or DKIM 

Where they are stored 

All three records are stored in the Domain Name System (DNS) as DNS TXT records

The DNS is publicly available and matches web addresses to IP addresses

Benefits Improve open rates and engagement with readers, Improve sender reputation, Prevent emails from being marked as spam, Increase email deliverability, and Protect your brand and customers from malicious actors. 

How to check 

Most email clients have an option to display the full version of an email, including its header

The header is where mail servers append the results of SPF, DKIM, and DMARC

 

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