Spring '26 "Authorized Email Domains" security enhancements.

The Spring '26 release enhancements for Authorized Email Domains also changes security for some of the legacy verifications notably:

1. Per the process to Disable Email Change Verification the need for entries for Allowed Domains is now mandatory.  From the Spring release date organizations will not be able to send email to domains that do not have Allowed Domains listed on the Salesforce side.  To workaround this use the Authorized Email Domains process to solve this problem or make a request for Allowed Domains to be added on the Salesforce side per the Disable Email Change Verification until your organization can deploy Authorized Email Domains

2. Also with Spring '26 the use of verified "email to case" or organization wide email addresses as return address in Personal Settings will require added verification to ensure emails are verified in the user context.