Cloudflare has introduced ARC support to Email Routing to comply with Email Authentication requirements and improve deliverability.

Cloudflare email routing feature makes it possible to create a number of email domains for your business and route incoming emails to one central email. For example, forward emails sent to,, and, to one central email

Recently, Yahoo and Gmail announcedthat starting from February 1, 2024, if you regularly forward emails, you are required to add ARC headers to outgoing emails. The ARC headers will be used to validate the authenticity of forwarded emails. This is among the many email authentication requirements introduced by Yahoo and Gmail, which bulk senders must comply with by February 1, 2024.

In response, Cloudflare has announced that Email Routing now supports ARC. For example, if sends an email to mary@example.coom which forwards to, Cloudflare email routing will add ARC-Authentication-Results and then ARC-Seal header in the forwarded email to show that the email originated from a valid domain, and it passed all email authentication rules (DKIM, SPF, and DMARC).

Read more on a summary of how Authenticated Received Chain (ARC) works or a comprehensive explanation of the ARC protocol.