SPF vs DKIM vs DMARC

SPF, DKIM and DMARC are related but different email-authentication mechanisms used to help receiving systems verify mail and enforce domain policy.

What to focus on

• SPF authorizes sending infrastructure
• DKIM signs messages cryptographically
• DMARC aligns authenticated mail with the visible From domain and publishes policy/reporting

Think systemically

Configuration mistakes can affect mail flow, so use your provider’s current documentation and DNS instructions.

For the broader operating system, see email marketing best practices and software selection.