First of all find the name of your iCloud account on the left side of the main Mail window of your screen. If your account name is dimmed and has a lightning-bolt symbol next to it, then your account is offline. If you want take your account online, connect to the Internet, then select to Mailbox > And take All Accounts Online. These steps will definitely help you to receiving emails on iCloud . If you still want to help, then follow the steps are given below:- 1. Select Mail > Preferences. 2. Click the Accounts tab button. 3. And then choose your iCloud account from the list of accounts. 4. Now click the Advanced tab button and check your settings: • Port: 993 • Select Use SSL • Authentication: Password or Apple Token If you want help sending or receiving mail on your iPhone, iPad, or iPod touch then these steps will help you:- 1. First of all make sure that you're connected to Internet. And try to open app...