To use the IMAP Administrator's Access Port, you'll need to do the following:
- Turn on access to the port in the Advanced Settings of the Mail Server administrator's program.
- Use an IMAP client that supports nested folders and allows you to change the default port for IMAP connections. The port should be changed to 626.
- Log in from the IMAP client as an administrator of the Mail Server. You might set up user "Mail Administrator" as the account which will e used to access this port. Make sure user "Mail Administrator"--internet alias for this user is "Postmaster", has log in enabled, is set to administer the server, and has IMAP enabled.
The examples below illustrate setting up such a connection using Microsoft's Outlook Express.
In your IMAP client software, configure an account as Postmaster:

Figure 1: Postmaster Image
Configure the client to connect at the IMAP Admin. Access port.
In MS Outlook Express, this is done by selecting the "Advanced" button when setting up the account. Other IMAP clients may have this option elsewhere (or not at all):

Figure 2: Advanced Image
By selecting the "Override default IMAP Port" option, you can set the client to connect to the IMAP Admin. Access port.
When logged on, here's what you'll see:
Folders for all hosts and users., containing any mail on the server. Mail can be opened, forwarded, deleted, etc.

Figure 3: Preferences Image