[DMARC] Update note (#24203)

Author: Maddy-Cloudflare

src/content/docs/dmarc-management/enable.mdx

@@ -14,7 +14,8 @@ You need to enable DMARC Management to allow Cloudflare to process DMARC reports
 
 :::caution[A warning on DMARC Management and SPF records]
 
-DMARC Management does not support actions on SPF records when your zone has a CNAME record that points to a different domain. Changing the SPF record would make DMARC rules invalid, as Cloudflare cannot change other DNS records to reflect your updates.
+DMARC Management does not support modifications to SPF records when a CNAME record in your zone points to an external domain. Any changes to the SPF record could invalidate your DMARC policy, as Cloudflare cannot update the associated external DNS records. We recommend managing SPF updates directly through the external domain's DNS provider.
+
 :::
 
 1. Log in to the [Cloudflare dashboard](https://dash.cloudflare.com/), and select your account and domain.