By default, all mail files that are created list the person who created the file as manager.

This is a safety factor to ensure that someone has manager access to the file. You will need to remove the user name and replace it with a different administrator, if you do not want his name in that file.

Hello Bradley,

Thank you for taking the time to respond to the post.

This is tricky as the junior admin may create the mail database for a new manager but he does not need to access that database afterwards.

When a new user is registered using Full Access Admin, the generic admin account, Notes/Admin is listed as manager instead of the user who switched to Full Access Admin mode.

Can't this be achieved when an admin with restricted access registers a new user, that is, Notes/Admin listed as manager for the database instead of the name of the junior admin who registers the database?

If your jr admins are in a group, set in the default mail9.ntf ACL a entry of  [GroupName] to no access.(yes with brackets)
​When a new mail database is created, the GroupName will appear in the ACL and any member in the group will be denied access.
​-make sure you set the GroupName document ACL (in domino directory) to only allow FullAdmins and LocalDomainServer to access to stop
​Jr Admins from elevating their privileges by removing themselves from the group on the fly as well as edit FullAdmins or LocalDomainServers group documents to stop them from elevating themselves. (it's easy to lock yourself out so pay attention.. make a backup before you start)

If he/she uses the Adminp process to create the accounts, he/she will not be in the ACL at all in either case.
​if you manually create a new db from the template, then the creator is the manager of the DB. (sounds like this is what's happening)

​the Jr admin will have to run everything from the console for db maintenence and cannot access the mail file directly.
If the end user has a particular problem with a email and Admin eyeballs need to see it, the Jr Admin cannot help. (unless the end user grant's the Jr explicitly, from their mail preferences..)