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SPF, DKIM and DMARC are email authentication methods which work together to verify email sent from your domain is legitimate.
SPF – specifies which email servers are allowed to send email from your domain, reducing the risk of spoofed email sent from you.
DKIM – authenticates the sending domain with a digital signature, improving deliverability of email.
DMARC – if a recipient receives unauthenticated email from your domain the DMARC record tells the recipients email server if to reject the email. Ensuring authenticity of emails from your domain.