text: import six
  
  from poplib import POP3, POP3_SSL
  
  from .base import EmailTransport, MessageParseError
  
  
  class Pop3Transport(EmailTransport):
      def __init__(self, hostname, port=None, ssl=False):
          self.hostname = hostname
          self.port = port
          if ssl:
              self.transport = POP3_SSL
              if not self.port:
                  self.port = 995
          else:
              self.transport = POP3
              if not self.port:
                  self.port = 110
  
      def connect(self, username, password):
          self.server = self.transport(self.hostname, self.port)
          self.server.user(username)
          self.server.pass_(password)
  
      def get_message_body(self, message_lines):
          if six.PY3:
              return six.binary_type('\r\n', 'ascii').join(message_lines)
          return '\r\n'.join(message_lines)
  
      def get_message(self):
          message_count = len(self.server.list()[1])
          for i in range(message_count):
              try:
                  msg_contents = self.get_message_body(
                      self.server.retr(i + 1)[1]
                  )
                  message = self.get_email_from_bytes(msg_contents)
                  yield message
              except MessageParseError:
                  continue
              # self.server.dele(i + 1)
          self.server.quit()
          return
  