Symmetric Cryptography no mail for John

hello! Could someone help me?
I am having trouble executing path 7. At the john@localhost prompt, type mail and press Enter to read John’s local system mail. that’s is error.
After typing the mail I got the answer, no mail for John as I attached the printscreen below.
Captura de Tela 2024-12-30 às 15.14.28

Hey there! It looks like you’re missing the quotations around For John at Step 5.

The instructions read:

  1. At the cybrary@localhost prompt, type cat keyforjohn.send | mail -s “For John” john and press Enter to mail the shared key to the user john.