# File lib/mail/fields/content_transfer_encoding_field.rb, line 11
    def initialize(value = nil, charset = 'utf-8')
      self.charset = charset
      value = '7bit' if value.to_s =~ /7-?bits?/i
      value = '8bit' if value.to_s =~ /8-?bits?/i
      super(CAPITALIZED_FIELD, strip_field(FIELD_NAME, value), charset)
      self.parse
      self
    end