Mail Server Already Exists error iPhone iOS 11

Issue:

When open an email box, error appeared on iPhone warning: Cannot verify Mail Server Identity. One solution for this problem is to delete that mail account on iPhone and add it back. However, after account deleted, I could not add it back with the following warning:

Mail Account already exists

Solution:

Logout iCloud on the iPhone

Add the deleted mail accounts

Tricks:

In previous version of iOS, when it showed that the system could not verify the mail server, it was easy to fix by accepting the certificate of the mail server. In my case, the certificate was expired, and I did not want to pay for SSL certificate renewal.

After deleting the mail account, actually it will not be listed on the account list. Thus, there is no clue why the error message was prompted.

Config:

  • hardware: iPhone 6S
  • iOS:  11.2.1

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