docs: def cmd(self, cmd, verbose=False):
          """Executes the specified command on the remote host.
  
          The cmd must be format safe, this means { and } must be doubled, thusly:
  
            echo /var/local/maildir/{{cur,new}}
  
          the cmd can include the format word 'maildir' to be replaced
          by self.directory. eg:
  
            echo {maildir}/{{cur,new}}
          """
          command = cmd.format(maildir=self.directory)
          if verbose:
              print(command)
          p = Popen([
                  "ssh",
                  "-T",
                  self.host,
                  command
                  ], stdin=PIPE, stdout=PIPE, stderr=PIPE)
          stdout,stderr = p.communicate()
          return stdout