'Process a NEWNEWS command.  Arguments:
- group: group name or \'*\'
- date: string \'yymmdd\' indicating the date
- time: string \'hhmmss\' indicating the time
Return:
- resp: server response if successful
- list: list of message ids'

def newnews(self, group, date, time, file=None):

    cmd = ((((('NEWNEWS    ' + group) + '    ') + date) + '    ') + time)
    return self.longcmd(cmd, file)
