How I Got My Business Emails Through Spam Filters With SPF, DKIM, and DMARC
ZDNET, Wednesday, May 27th, 2026
Learn to configure SPF, DKIM, and DMARC DNS records to prevent emails from landing in spam and protect your domain from spoofing.
SPF, DKIM, and DMARC are three essential DNS-based authentication records that prevent legitimate business emails from being filtered as spam and protect domains from being hijacked by cybercriminals.
SPF verifies authorized mail servers, DKIM adds cryptographic signatures to confirm emails haven't been altered, and DMARC ties them together by setting policies for failed authentication checks.
Major email providers including Gmail, Yahoo, Outlook.com, and Hotmail now require these authentication methods for bulk senders, making them mandatory rather than optional.
The article provides step-by-step instructions for configuring all three records through domain registrars and email service providers.