Server is waiting for your input. To authenticate yourself start with HELO
* In any state of your dialog with mailserver (except when entering the message text) you can type QUIT to end your SMTP session.
* Commands are not case-sensitive.
* If any email address doesn't contain domain part (anything after @ sign), mailserver assumes it's a local account and adds mailserver hostname
* If demo doesn't accept keyboard input, click anywhere within "terminal screen".
