class Mail::Message

mail.cc #=> ['mikel@test.lindsaar.net', 'ada@test.lindsaar.net']
mail.cc = 'Mikel , ada@test.lindsaar.net'
mail.cc #=> ['mikel@test.lindsaar.net']
mail.cc = 'Mikel '

Example:

Sets the Cc value of the mail object, pass in a string of the field

def cc=( val )
  header[:cc] = val
end