These instructions are for those with an SSL certificate for their domain. If you do not have an SSL certificate, please refer to the instructions here.
2) Select the link "Email Accounts"
3) Select the link "Manage" next to the mailbox you would like to setup
4) Here you can find the available mail client automatic configuration scripts. Select the script for your mail client and operating system. Under the "Mail Client Manual Settings" heading, you can find all the required manual settings for other email clients.