--- a/management/univention-directory-manager-modules/modules/univention/admin/handlers/settings/usertemplate.py	
+++ a/management/univention-directory-manager-modules/modules/univention/admin/handlers/settings/usertemplate.py	
@@ -401,8 +401,8 @@ mapping.register('homedrive', 'sambaHomeDrive', None, univention.admin.mapping.L
 mapping.register('phone', 'telephoneNumber')
 mapping.register('employeeType', 'employeeType', None, univention.admin.mapping.ListToString)
 mapping.register('secretary', 'secretary')
+mapping.register('departmentNumber', 'departmentNumber', None, univention.admin.mapping.ListToString)
 mapping.register('street', 'street', None, univention.admin.mapping.ListToString)
-mapping.register('postcode', 'postalCode', None, univention.admin.mapping.ListToString)
 mapping.register('city', 'l', None, univention.admin.mapping.ListToString)
 mapping.register('disabled', 'userDisabledPreset', None, univention.admin.mapping.ListToString)
 mapping.register('pwdChangeNextLogin', 'userPwdMustChangePreset', None, univention.admin.mapping.ListToString)
@@ -410,7 +410,7 @@ mapping.register('homeShare', 'userHomeSharePreset', None, univention.admin.mapp
 mapping.register('homeSharePath', 'userHomeSharePathPreset', None, univention.admin.mapping.ListToString)
 mapping.register('primaryGroup', 'userPrimaryGroupPreset', None, univention.admin.mapping.ListToString)
 mapping.register('groups', 'userGroupsPreset')
-mapping.register('mailPrimaryAddress', 'mailPrimaryAddress', None, univention.admin.mapping.ListToString)
+mapping.register('mailPrimaryAddress', 'mailPrimaryAddress', None, univention.admin.mapping.ListToLowerString)
 mapping.register('mailAlternativeAddress', 'mailAlternativeAddress')
 
 
--