Rails - Jul 2012 - ActionMailer doesn't accepts content_type when the body of the message is from RTE

Hello I have a problem with the content type of ActionMailer. I am using 
markit-up and when I submit the form and send email with the entered 
message I get this in my box:
<a href="http://gmail.com">This is a message</a>. I have
this in my
mailer:     
      
mail(:content_type=>"text/html",:to=>@email,:subject=>"Generated
certificates",:body=>issuer_mes.body)

 where issuer_mes.body is the entered message. Can you help me? Thanks in 
advance :)

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