How to configure Zimbra Desktop to connect to an email account
Zimbra Desktop is a free email client for users of Windows, Linux and Mac OS X. You can download it from the official site.
To create a new email account that you can later add in Zimbra, go to the Email section of the Pixie control panel. To learn how to create an email account read the tutorial on creating an email account.
If there are no accounts added in Zimbra, when you start it the setup process will begin automatically. Just click on the Add New Account button on the first page that appears after you start the application. On the next screen select IMAP or POP from the Account Type drop-down menu and the rest of the options will appear automatically. In the first three fields (Account Name, Your Full Name, Email Address) you have to type an account name (any name), your name and the full email address (e.g. email@example.com).
In the Receiving Mail section (on the same page) you have to enter your full email address again and its password in the User Name and Password fields respectively. In the field for Incoming Server you can type either just your domain name (e.g. yourdomain.com), provided it points to our servers and you don't want to use encryption, or the name the HostKnox server hosting your account. If you want to use encryption, however, you have to use the name of the server.
The same is true for SMTP Server. If you want to use encryption you also have to mark the SSL button for the incoming server and the checkbox labeled Use SSL encryption when sending mail for the SMTP server.
Make sure the port numbers are correct and change them if necessary: 465 for outgoing (SMTP) server with encryption; 587 for SMTP without encryption; 993 for IMAP incoming with encryption; 143 for IMAP without encryption; 995 for POP incoming with encryption; 110 for POP without encryption.
The last thing you have to do on the options screen is to mark the checkbox for Username and password required to send mail. When you mark the checkbox two new fields will appear (User Name, Password) in which you have to enter your full email address (e.g. firstname.lastname@example.org) and the password. After that click on Validate and Save and then on Launch Desktop.
You can edit the account's settings or add new accounts from the Setup button of the desktop.
For screenshots and some more details you can check the tutorial on configuring Zimbra Desktop to connect to your email account.