Sendmail command freezes
 

Whenever I try and use the "sendmail" command, it freezes as such:

I have also tried the "mail" command (I don't know what the difference is), and this is what happens:

Any help appreciated. Thanks in advance. :D

press Ctrl+D (twice)

That should unhang it
That said:

root@laptix chakkerz # sendmail bob@ebwac.org
The message <CTRL+D><CTRL+D>
root@laptix chakkerz #

OK, I got it. After subject, it was waiting for me to type the message.