1. Choose Accounts.

2. Choose Add account.

3. Scroll down and choose Advanced setup.

4. Choose Internet email.

5. Fill all informations:
Email address = your email address
User name = your email address
Password = your email acount’s password
Account name = You can choose name to your email account

6. Send your message using this name = your name, as shown to others
Incoming email server = mail.shellit.org
Account type = IMAP4
Outgoing (SMTP) email server = mail.shellit.org

7. Select all checkboxes and choose sign in.

8. Choose done and now you can use your email in Windows 11 Mail.