75488: Merged V4.2-BUG-FIX (4.2.3) to HEAD-BUG-FIX (5.0/Cloud)
74477: Merged DEV to V4.2-BUG-FIX (4.2.3).
73923: MNT-11654: Manage System Users: Email domain, which contains underscore, is not valid.
73998: MNT-11654: Manage System Users: Email domain, which contains underscore, is not valid.
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@77450 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261