[phoenix]

If the mail is hosted externally the you have three choices of getting it into Zimbra and it depends on whether your host has a single mailbox for all your mail or individual mailboxes for each user. If they have a single mailbox then you could use fetchmail (search the forums for the words 'fetchmail aggregation') to get it into Zimbra and drop it into the mailboxes, if they have individual mailboxes for each user then there's a feature in Zimbra (in the users Preferences/Accounts tab) that will allow each user to get external mail and view it in their Zimbra account. The final option is to have the mail delivered directly to your Zimbra server, that's the most effective solution.