ContentEncoderInterface

class \Symfony\Component\Mime\Encoder\Base64ContentEncoder extends \Symfony\Component\Mime\Encoder\Base64Encoder implements \Symfony\Component\Mime\Encoder\ContentEncoderInterface
class \Symfony\Component\Mime\Encoder\EightBitContentEncoder implements \Symfony\Component\Mime\Encoder\ContentEncoderInterface
class \Symfony\Component\Mime\Encoder\QpContentEncoder implements \Symfony\Component\Mime\Encoder\ContentEncoderInterface