No error is shown when trying to add invalid email to work notes list

No error is shown when trying to add invalid email to work notes list.

1. Open any incident.
2. Click on Work notes list lock icon.
3. Add an invalid email address.
   For example, Y@Y.
   Note that no error message is displayed to indicate the invalid email.

After carefully considering the severity and frequency of the issue, and the risk of attempting a fix, ServiceNow has decided to not address this issue in a future release. We do not make this decision lightly and we apologize for any inconvenience. If you have questions regarding this problem, contact ServiceNow Technical Support.