Ruby on Rails

Hello, I am using ActionMailer and rails 3.0.9 and I want to add a content to an email that the user has entered but when I write: mail(...,:body=>"Something") I can't send the email. I tried mail(....) do |format|
                                                                                                                                                                                                      format.html {render :template=>'some'}
                                                                                                                                                                                               end
but that didn't changed the content of the email. Can someone help me? Thanks in advance :)

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