DNS Problem with reverse resolucion

[binover]

Hi guys, I have a little problem (well isn't little any more), a client said they don't have revers resolution for theirs mails servers. I checked and the server resolves it right:

;; ANSWER SECTION:
16.224.107.200.in-addr.arpa. 86400 IN PTR pop3.mdidacticoregional.com.ar.
16.224.107.200.in-addr.arpa. 86400 IN PTR nexion.com.ar.
16.224.107.200.in-addr.arpa. 86400 IN PTR mdidacticoregional.com.ar.
16.224.107.200.in-addr.arpa. 86400 IN PTR ftp.nexion.com.ar.
16.224.107.200.in-addr.arpa. 86400 IN PTR ftp.mdidacticoregional.com.ar.
16.224.107.200.in-addr.arpa. 86400 IN PTR www.nexion.com.ar.
16.224.107.200.in-addr.arpa. 86400 IN PTR www.mdidacticoregional.com.ar.
16.224.107.200.in-addr.arpa. 86400 IN PTR mail.nexion.com.ar.
16.224.107.200.in-addr.arpa. 86400 IN PTR pop3.nexion.com.ar.

but I checked it in http://pingability.com/zoneinfo.jsp?domain=nexion.com.ar
and say the domine doen's have reverse resolution... , there isn't revers resolution in other servers than the local. I don't understand what is happending, y chage the serial numbers and steal nothing.

This only happends in this domine, the others run well.

any idea?

The domine is nexion.com.ar, ip 200.107.224.16, dns 200.5.90.197.

[marpada]

I think the owner of the IP address range should register the reverse zone resolution, ask your ISP for that.
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[binover]

we are the owers of the IP Range

[falko]

What's in your named.conf?