Protocol specifying authorized servers allowed to send emails.
Phishing attack on vertigo360.me highlights risks when SPF and DMARC policies are missing.
Using wildcard DMARC policies without SPF support can negatively impact email deliverability and client trust.
Emails bounced in CRM due to missing DKIM signatures and strict DMARC reject policy.
Attackers exploited Google Calendar to send phishing emails, causing DMARC failures for Yahoo recipients.
Non-compliant emails face gradual rejection; ensure DKIM, SPF, and DMARC are properly configured.
Domain authentication alone doesn’t guarantee deliverability; security and compliance are critical for email success.
p=reject DMARC blocked Mailchimp emails due to DKIM failures, despite unchanged DNS and Cloudflare settings.
