Mail gem - how to clean up the body string

I'm trying to read an email using ruby mail gem. But mail.body.decoded returns me not just the body message. How can I clean up this body message and remove unwanted text like:

-20cf30433c9a437cc304939017ef\nContent-Type: text/plain; charset=ISO-8859-1\nContent-

message = $stdin.read
mail = Mail.read_from_string(message)
puts mail.body.decoded

--20cf30433c9a437cc304939017ef\nContent-Type: text/plain; charset=ISO-8859-1\nContent-Transfer-Encoding: quoted-printable\n\n REAL BODY TEXT \\n\n--20cf30433c9a437cc304939017ef\nContent-Type: text/html; charset=ISO-8859-1\nContent-Transfer-Encoding: quoted-printable\n\n<br clear=3D\"all\">--20cf30433c9a437cc304939017ef--

How can I clean up this email body mail message extracting only the REAL BODY TEXT , without ANY header ?

I'm creating a simple Ticket System based in Ruby on Rails, and a ticket is created when an email is received by ticket@mydomain.com. But when the message is in HTML format the BODY TEXT is surrounded by HEADERs text.