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 for unauthenticated
> connections.
> Giving up on ##.##.213.98.

This error means that remote mail server declined your connection because your IP address is not resolved:

# host ##.###.95.197
Host ###.##.101.87.in-addr.arpa not found: 3(NXDOMAIN)

Please contact your ISP to make reverse zones for your IP addresses configured, according to WHOIS the responsible company for your IP block is the following:

% Information related to ‘##.###.80.0 – ##.###.95.255’

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