Radius DMARC & email authentication

DMARC is an email authentication standard that helps protect your business's email domain from unauthorised use. It works with SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail) to verify whether emails claiming to come from your domain are legitimate and tells receiving email providers how to handle messages that fail authentication checks.

Any business using its own email domain can benefit from DMARC, regardless of size. If you regularly send invoices, quotes, customer communications or other important emails, authentication can help protect your domain against impersonation and support trustworthy communication.

Yes. Without effective authentication controls, cybercriminals may be able to forge your exact email domain to make fraudulent messages appear legitimate. DMARC helps receiving email providers identify these messages and apply the appropriate policies. It does not prevent every type of email impersonation, including the use of lookalike domains.

DMARC can help improve email authentication and support deliverability by allowing receiving providers to verify legitimate sending activity. However, inbox placement also depends on factors such as sender reputation, message content and recipient engagement, so DMARC cannot guarantee that emails will avoid spam folders.

Using Microsoft 365 or Google Workspace doesn't automatically mean your domain has effective DMARC enforcement in place. Your business may still need to configure and monitor DMARC, particularly if other platforms, such as CRM, accounting or marketing software, also send emails using your domain.

DMARC involves configuring DNS records and understanding which systems are authorised to send emails using your domain. Radius offers engineering-led implementation to help establish the appropriate configuration, alongside access to the EasyDMARC platform and Radius first-line support.