The "Email" field is now mandatory on User objects if "LDAP Sync" is enabled.
On an AE with LDAP enabled.
Create a User object. It must have "LDAP Sync" enabled on it, and must match an existing LDAP user
The corresponding LDAP user should NOT have any assocaited email
Try to save the User object with the "Email 1" field being Empty
Expectation : as mentioned in the Doc (https://docs.automic.com/documentation/webhelp/english/AA/12.3/DOCU/12.3/Automic%20Automation%20Guides/help.htm#AWA/AdministrationPerspective/AG_users.htm) the E-Mail 1 is optional : you should be able to keep it empty
Reality : this field is now mandatory
Release : 12.3
Component : AUTOMATION ENGINE