Assistance with reverse lookup zone

[Frank Pikelner]

Every now and then we get a bounce on emails that are sent through one of our mails servers located on 64.187.3.170. The bounce messages look as follows and appear to indicate that our reverse zone is missing a record, though the record is there and resolves through nslookup. The ISP delegates a number of IP addresses from the zone back to us (16 IP addresses). So my guess is that our zone file needs to be rewritten or there may be something else I'm missing.


<first_last at some_domain.com>: host mx.some_domain.com[xxx.xx.xx.xx] said: 450 4.7.1 Client
    host rejected: cannot find your hostname, [64.187.3.170] (in reply to RCPT
    TO command)


Performing a manual reverse lookup correctly displays the correct name for 170.3.187.64.in-addr.arpa. Our zone file looks as follows (other records removed):

$ORIGIN .
$TTL 86400      ; 1 day
3.187.64.in-addr.arpa   IN SOA  ns1.blue-dot.ca. dnsadmin.ns1.blue-dot.ca. (
                                2009011401 ; serial
                                1800       ; refresh (30 minutes)
                                900        ; retry (15 minutes)
                                604800     ; expire (1 week)
                                1800       ; minimum (30 minutes)
                                )
                        NS      ns1.blue-dot.ca.
                        NS      ns2.blue-dot.ca.
                        NS      ns3.blue-dot.ca.
$ORIGIN 3.187.64.in-addr.arpa.
170                     PTR     smtp3.netcraftcommunications.com.
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