I have problem with zoho mail settings in Windows 10 Mobile in my Lumia 640. I configured my account last week with imap settings, but all the time i have notification that my email account has a problem with settings. I have the same problem with default email client in Windows 10. All the time i put the same password, imap settings and still nothing. 

Could you help me?

Maybe you can create universal apps for Windows 10 Mobile like app for android. My wife is using android phone and everything is ok with your app. I had problem to configure default email client in android.

Thanks for your help,

Kuba