Cannot Verify Server Identity IMAP.Gmail here is the solution
This error occurs on iOS devices. This issue does not match the SSL certificate on the mail server and the server settings on your iOS device (iPhone, iPod, etc.)
First go to the settings in your iphone.
On settings go to “mail” and click it.
Here you will find “accounts” click on it.
Now click on the account on which you are facing problems.
On “Incoming Mail Server” the Host Name should be mail##.webmailaccess.net.
Once incoming mail server is added you change the outgoing mail server as well. from “Outgoing Mail Server” you’ll find SMTP and the mail server name click on it.
Use the host name same mail#.webmailaccess.net.
Now click Done or save.