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_l...@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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