# Nest a Distribution List or Prevent Nesting

This procedure describes the nesting of a distribution list within a distribution list. It also describes how to prevent mailbox owners from nesting distribution lists.

## Nesting a Distribution List

To nest a list:

1. Specify the list as a member of the list being created or modified.

2. Make sure the number of a nested list is different from the number of the distribution list that contains it.

## Preventing a Nested Distribution List

- To prevent nesting, customize an FCOS to include feature bit 222 (deny nesting of distribution lists) and assign it to the required mailboxes.

- Managing Distribution Lists