[ERRO] 550 inconsistent or no DNS reverse entry for ..

Cypher
(usa CentOS)

Enviado em 05/06/2015 - 14:59h

Galera estou com um problema aqui, e não sei onde começar para resolver,
como seguem a mensagem abaixo:

This is the mail system at host aguiaseguros.com.br.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<raquelpiccoli@terra.com.br>: host vip-us-br-mx.terra.com[208.84.244.133]
refused to talk to me: 450 4.7.1 Client host rejected: cannot find your
hostname, [177.87.231.218]

Reporting-MTA: dns; aguiaseguros.com.br
X-Postfix-Queue-ID: AC6CD1DBE002
X-Postfix-Sender: rfc822; eduardo@aguiaseguros.com.br
Arrival-Date: Fri, 5 Jun 2015 08:09:39 -0300 (BRT)

Final-Recipient: rfc822; raquelpiccoli@terra.com.br
Original-Recipient: rfc822;raquelpiccoli@terra.com.br
Action: failed
Status: 4.7.1
Remote-MTA: dns; vip-us-br-mx.terra.com
Diagnostic-Code: smtp; 450 4.7.1 Client host rejected: cannot find your
hostname, [177.87.231.218]


Alguém saberia me dar uma luz?