EdHans,
Thanks for that. We investigated further after your hotmail suggestion. We would like you to check the settings on the phone and see if the below settings are the same:
Mail settings Hotmail. (FYI, Same for Outlook)
POP / IMAP imap
Incoming server: outlook.office365.com
Incoming port: 993
SSl (security) incoming: ssl
Outgoing server: smtp.office365.com
Outgoing port: 587
Requires sign-in: yes
This is the step by step guide recommended, and they are saying to confirm it after creating it, then restarting the device. That just may be the key for your situation.
iPhone guide to setup Hotmail mail
Open 'Settings', click on 'Passwords & accounts' and 'Add account'.
click on 'Other'
Choose 'Add mail account', and enter the following information:
Name: your own name
Email: your Hotmail email address
Password: your Hotmail email password
Description: a personal description
Choose imap and enter the following details under 'Incoming mail server':
Hostname: outlook.office365.com
Username: your Hotmail email address
Password: your Hotmail email password
Under 'Outgoing mail server' enter the details below and choose 'next':
Hostname: smtp.office365.com
Username: your Hotmail email address
Password: your Hotmail email password
Make sure 'Email' is checked and click 'Save'.
Your email account is now saved. In the next steps we check if all settings are correct.
Click on your newly created email address and choose 'Advanced'.
Make sure that the following data is
correct under 'Incoming server':
Use SSL: on
Identity check: password
Server port: 993
Go back to the previous screen and under 'Outgoing server' click on smtp.office365.com.
Make sure the following information is correct:
Use SSL: on
Identity check: password
Server port: 587
Choose 'Done' at the top right and restart the iPhone to activate the settings
We hope we finally found a solution for you. If you still continue to need assistance after that, please get in touch with Apple Support directly next: Get Support
Cheers.