Apple iphone can't add 163 email account how to set?

1, small series in the mailbox when the use of the 163 account, but added when prompted "This account may not be able to send or accept e-mail" What is the problem? How to solve.

2, now we enter the computer, and then open the computer in 163 mailbox, enter the mailbox and click on the mailbox interface settings button

3, this will enter into the 163 mailbox interface settings interface, as shown in the following figure

4. After entering, we click the Pop3/smtp/imap option as shown in the 111CN screenshot

5, now according to the 111cn.net operation diagram, we can see after the Pop3/smtp/imap set the option to have three check option, you will find the IMAP option is the default does not tick

6, after the IMAP option ticked, and then we go back to the Iphone/ipad interface.

7, back to the ipad before the deletion, then it can be, OK.