This relates to my other open question, but wanted to ask it separately, as it affects other issues as well.
We have a one-domain forest, with multiple email domains available. I have different OU's set up for each email domain (such as abc.com and xyz.xom). The OU ABC allows me to create new users with a user login name of "email@example.com" as it shold. However, the OU XYZ also only allows me to create new users with login names of "firstname.lastname@example.org" rather than "email@example.com".
Where do i need to go to edit the OU so that the OU XYZ has the option for xyz.com?