If you have multiple addresses you want to be delivered to a mailbox, then you would want to use mailbox aliases. To setup a mailbox alias, do the following:
- In your client area, go to Services menu -> My Services and click on the Zimbra service
- NOTE: if you have multiple zimbra services, then pick the one that the mailbox is in
- Click on "Mailbox Aliases" or "Email Aliases"
- Enter the alias name in the alias field
- Pick which mailbox to alias
- Submit the form