554 This server requires PTR for unauthenticated

Hi. This is the qmail-send program at ns1.###.##. > I’m afraid I wasn’t able to deliver your message to the following > addresses. > This is a permanent error; I’ve given up. Sorry it didn’t work out. > > <@@@@@@@.@@>: > ##.##.213.98 does not like recipient. > Remote host said: 554 This server requires PTR …