If your hotmailcom txt 2021 file is an in raw text format, you cannot directly re-import it to Hotmail. Instead:
Hotmail (Outlook.com) IMAP Settings - Valid 2021 Username: yourname@hotmail.com Password: (use App Password if 2FA is enabled) IMAP Server: outlook.office365.com IMAP Port: 993 IMAP Encryption: SSL/TLS SMTP Server: smtp-mail.outlook.com SMTP Port: 587 SMTP Encryption: STARTTLS hotmailcom txt 2021