On my new iPhone 11, I can compose emails, view emails, but I cannot send emails. The system sends an error message that states "Send Failed: Your email failed to send and has been saved to the Drafts folder." I have four bars of LTE service and am connected to the internet with four bars of service.
The APP is not working so go to settings then my account then check email. You will be directed to webmail where you can go to the drafts folder, select your unsent emails and then select edit and after editing send it. It works.