Google Message Security for Google Apps Administration Guide - Manual (Page 86)

86 Message Security for Google Apps Administration Guide
The limit is configured there.
Changing this limit does not restore mail flow to the user.
How can I view a list of all my user aliases/nicknames?
You can see a list of users and aliases/nicknames through the Administration
Console:
1. Go to Orgs and Users > Users.
2. Select the Include: aliases check box, then click Search.
3. You see a list of all users and their aliases/nicknames in your org structure.
4. To narrow this search, you can enter special criteria into the Find User text
box.
You can also see a list of aliases/nicknames in the Usage Details. You must be
logged in as an administrator on the Account level org to do so.
1. Go to Orgs and Users, then click the Account level organization in the list of
organizations.
2. In the Organization Management page, scroll down to Organization Settings
and click Usage Details.
3. On the Monthly Usage Details page, go to Alternate Addresses.
You see a list of alias addresses, sorted by organization. This information is
compiled monthly, so recent changes are not be included in this report.