DOCUMENT:Q230665  23-OCT-1999  [exchange]
TITLE   :XADM: Why a DL Cannot Be the Owner of Another DL
PRODUCT :Microsoft Exchange
PROD/VER:winnt:5.5
OPER/SYS:
KEYWORDS:exc55

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The information in this article applies to:

 - Microsoft Exchange Server, version 5.5 
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SUMMARY
=======

You cannot define one Exchange Server distribution list (DL) as the owner of
another Exchange Server DL. If you try to make one DL become the owner of
another DL through the Exchange Server Administrator program, you receive the
following message:

   A Distribution List cannot be the owner of a Distribution List. Would you
   like to choose another recipient to be the owner of this Distribution List?

Through bulk import, you can bypass this message and force a DL to be the owner
of another DL, but the ownership will not be effective.

MORE INFORMATION
================

Any Windows NT account with User permissions on a distribution list has
permissions equivalent to Owner permissions. In fact, the Owner dialog box is
simply a friendly interface for adding and removing User permissions for a DL.
The Windows NT permissions are used to validate "Owner" access during everyday
operation, not the Owner value itself.

When you modify or clear the Owner attribute, the Administrator program checks
the Permissions page and makes appropriate changes. The Owner attribute is also
checked against the Permissions page whenever the DL properties are accessed in
the Administrator program.

To directly monitor who has effective Owner permissions on a DL, monitor the
Permissions page as well as the Owner value. By default, the Permissions page
for a DL is not displayed in the Administrator program interface. To display
this page:

1. On the Tools menu, click Options.

2. Click Permissions.

3. Click to select the "Show Permissions page for all objects" check box.

If you change the primary Windows NT account for a mailbox that is owner of a DL,
the DL owner can lose the ability to modify the list. You can correct this by
accessing the DL properties, and clearing and readding the owning mailbox. This
forces an update of the Windows NT permissions on the DL.

Be aware that even if you have the proper Windows NT account permissions on a DL,
you still cannot modify it from the client address book unless you are logged on
to a mailbox in the DL's home site because copies of the DL in sites other than
its home site are read-only.

If you want to achieve the functional effect of having a DL own a DL, you can do
so by using Windows NT groups in either of two ways:

 - Create a mailbox, such as DL-Name-Owners, and assign a Windows NT group as
   the primary Windows NT account for the mailbox. Then assign the mailbox as
   Owner of the DL. You can then update Owner privileges on the DL by updating
   membership in the Windows NT group.

 - Directly assign User permissions on the DL to a Windows NT group, and then
   update permissions on the DL by updating membership in the Windows NT group.

Although the first method is more complicated, it has two advantages. First, it
is "self-documenting"--the scheme is more obvious to new or inexperienced
administrators. Second, the existence of the owner mailbox in the DL's home site
allows administrators whose own mailboxes are in different sites to still
administer the DL by logging on to the local Owner mailbox.

Additional query words:

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Keywords          : exc55 
Technology        : kbExchangeSearch kbExchange550 kbZNotKeyword2
Version           : winnt:5.5
Issue type        : kbinfo

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