Reverse lookup not working

Due to a knew provider I had to change all of our outside A and reverse lookup records. We can resolve names just fine but not IP's. We have a 24bit mask and I created our records with the last octet of each IP - ie x.x.x.249 has a reverse record of 249. Due to this problem we are having a lot of mail rejected by other institutions. I had one of them do an nslookup to our mail servers IP address for me and the result was - default server unavailable, server failed. Any ideas what might be wrong?
Thanks in advance
Hazel

A common mistake when creating in-addr.arpa zones is to enter a 0 for
the host portion of the IP rather than leaving the field(s) blank. For
example, you would end up with a zone named 0.1.168.192.in-addr.arpa
rather than 1.168.192.in-addr.arpa, which is the correct way.
If this is not the issue, please post your config and maybe a debug log,
and maybe someone will see the problem.

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