HTTP Attacks - SMTP Header Injection

I’am stuck for several days. I know how to explore it, but i can’t see no emails sent because MailHog remains disconnected. I put in /etc/hosts connected to "mail.smtpinjection.htb en starts firefox with URL “mail.smtpinjection.htb:”. Page is showing MailHog but “Disconnected”!!!
Please help.

Maybe it has something to do with an error:
Firefox can’t establish a connection to the server at ws://mail.smtpinjection.htb:44855/api/v2/websocket. ???

Just succeeded. “MailHog Disconnected” is not the problem in this box. It can still still receive/send emails provided the correct POST request is sent

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What’s the secret?