[ubuntu] problem with mail in terminal

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http://ubuntuforums.org – Hi I read about mail in linux and I installed mailutils to send mail in command lines. at first when I pressed ctrl+D to end the mail body, mail text ended. but the problem was that it didn't send mails at all. now moreover than that problem, even ctrl+D also does not work and after ctrl+D, I must use ctrl+C to end the mail. I dont know exactly what mistake I did during this time that now my ctrl+D does not work. hence 2 questions: 1- when I want to send email is mailutils enough or I have to install any other service or do I need something like ssmtp? 2- why ctrl+D does not work but at first (Hardware)