Zimbra and iPhone
The Apple iPhone can be used to access Zimbra Collaboration Suite using IMAP or Safari. If using Apple Mail, your mail configuration settings will automatically be transfered to the iPhone during the initial sync with iTunes. The iPhone supports IMAP, POP, and Exchange (IMAP) accounts like Apple Mail. However, the iPhone will accept multiple Exchange accounts that can be used with the Zimbra Collaboration Suite server unlike Apple Mail 2.1.1 which accepts just one.
It is important to note iPhone 1.0 does not support Exchange ActiveSync and the Exchange configuration uses the IMAP protocol for retrieving mail. Calendar and address book information is synced with iTunes.
Configuring IMAP, POP, or Exchange
1) Under Mail settings, select "Add Account..."
2) Select "Other" 3) Select "IMAP" 4) Fill in the "Name", "Address", and "Description" fields 5) Provide "Host Name", "User Name", and "Password" in the "Incoming Mail Server" section. The iPhone will automatically detect IMAP over SSL if your server requires it. If your server requires a non-default TCP port specification, use the hostname:port format in the "Host Name" field. SSL settings can be adjusted later under the "Advanced" section in the mail account settings. 6) In the "Outgoing Mail Server (SMTP)" section, provide settings for "Host Name", "User Name" and "Password". As with the incoming mail server, the "Host Name" setting accepts the hostname:port format if the outgoing mail server uses a non-default TCP port. 7) Save the configuration