Why Email Aliases Fail DMARC (And How to Fix Them)
Security Boulevard, Wednesday, May 28th, 2025
An email alias is an alternative email address that redirects messages to a primary email inbox. An alias does not have its own mailbox and is simply responsible for forwarding messages to one or more designated email addresses.
DMARC can fail for email aliases depending on how the message is altered during forwarding. In this blog, we will break down the various scenarios affecting DMARC authentication for email aliases.
Reasons for DMARC Failure for Email Aliases
DMARC may fail for email aliases, depending on how the alias is configured and how the forwarding process alters the original message. Whether you send personalized emails that are perfectly legitimate, the following scenarios can affect authentication: