Salesforce MCE User Domain Change Affects Some New Senders
A 4 October change narrows sender verification.
Salesforce’s Marketing Cloud Engagement User Domain notice applies to organisations that created User Domains since 1 February 2026 without a domain verified for their account. From 4 October 2026, new From Addresses on unverified domains no longer receive verification emails. Salesforce says an error appears instead.
Before adding a sender, compare its domain with your account’s Verified Domains. If absent, Salesforce documents registered domain, Private Domain and Sender Authentication Package routes. Allow for setup time.
Existing From Addresses need no action under this change. The notice does not describe a general email-sending outage.
