Isn't this the purpose of SPF/DKIM? https://www.cloudflare.com/learning/email-security/dmarc-dkim-spf/ https://www.cloudflare.com/learning/email-security/dmarc

Isn't this the purpose of SPF/DKIM? https://www.cloudflare.com/learning/email-security/dmarc-dkim-spf/ https://www.cloudflare.com/learning/email-security/dmarc-dki...