server returned error

I receive There may be a problem with the mail server or network. Verify the settings for account “iCloud” or try again. The server returned the error: The connection to the server “p02-imap.mail.me.com” on port 143 timed out.

I am not able to receive e-mail. When I click on the triangle with the ! next to the mailbox I get the following message: ALERT:

There may be a problem with the mail server or network. Verify the settings for account “iCloud” or try again.

The server returned the error: The connection to the server “p02-imap.mail.me.com” on port 143 timed out.