Go to settings > Passwords & Accounts.
from here you can add your mail account by pressing on "Add Account" and in the next screen choose the option "other".
The next screen will ask you what kind of account you want to add, we choose here "add mail account" and fill out your own mail settings in the next screen (the mail settings are mailed to your personal account).
When using IOS 12 or older the following information can be asked, IOS 13 or newer will skip this.
The settings are as follow:
Username: [email protected]
IMAP hostname: novonto.net
IMAP port: 993
IMAP security: SSL IMAP auth
method: Normal password
SMTP hostname: novonto.net
SMTP port: 587 SMTP
When finished choose the option mail and your settings will be saved, now you can send and receive mails from the Mail app.