Read mail terminal 21

I'd be happy to help! However, I need more information from you. Could you please provide more context or clarify what you mean by "read mail terminal 21"?

Are you referring to a specific email or message that was sent to a terminal with the subject "Terminal 21"? Or are you asking me to read a specific terminal output or log file that contains information related to Terminal 21?

If you could provide more details or clarify your question, I'll do my best to assist you.