dmarc-adkim-tag

Email authentication: SPF, DKIM, DMARC, BIMI and MTA-STS

DMARC adkim=r Relaxed Default Subdomain Matching Explained

Understand DMARC adkim=r relaxed default subdomain matching. Learn how it affects deliverability, alignment, and email verification accuracy with.

Email authentication: SPF, DKIM, DMARC, BIMI and MTA-STS

DMARC adkim=s: When to Use Strict DKIM Alignment in 2026

Learn when to enforce DMARC adkim=s strict DKIM alignment to prevent spoofing and improve inbox placement.