Yes, you can access multiple email boxes from a Webmail account. To do so:
1. Login to Webmail
2. 'Click' on 'Options'
3. Select 'Mail'
4. Click on the 'Fetch Mail' option
5. Put a check mark in the preferences for accessing other mail accounts
a. Fetch Mail in a separate window
b. Show the Fetch Mail icon on the menu bar
6. Click on the 'Edie your preferences for accessing other mail accounts' blue sentence.
7. Click the 'Create a New Account' button
8. In the drop down menu below 'Mail server type to connect to: Select 'IMAP Server Only'
9. Enter the information from the email address you want to connect to starting with:
a. Account's Name
b. Protocol will ALWAYS be IMAP
c. User name
d. Password
e. Server (i.e. mail.domainname.com)
f. Remote Mailbox: INBOX <-- needs to be entered
g. Local Mailbox: Leave the drop down to Inbox or choose a specific folder you want mail to go to.
h. Put a check in the following options (This will make it so that you do not receive multiple duplicate messages)
1. Get only new messages
2. Mark messages as seen
10. Click the 'Create' button at the bottom