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https://issues.apache.org/jira/browse/JAMES-796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12511146
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Stefano Bagnara commented on JAMES-796:
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At a first glance it seems to me that you are using a buggy dns cache (dns
server).
It's not up to the resolver (dns client) to iterate against NS: this is what
dns caches are for.
If you have the behaviour above then I guess your dns servers (again, the
correct name is "dns caches", but we use dns servers in JAMES Server
configuration file) have problems.
Try simply changing the dns server configuration to some better server.
> Do also query authoritative nameservers to obtain MX record
> -----------------------------------------------------------
>
> Key: JAMES-796
> URL: https://issues.apache.org/jira/browse/JAMES-796
> Project: James
> Issue Type: Improvement
> Reporter: Armin Häberling
>
> for example for zunft-oberstrass.ch
> DNSServer.lockup("zunft-oberstrass.ch", Type.MX, "MX")
> will return null, but
> DNSServer.lockup("zunft-oberstrass.ch", Type.NS, "NS")
> will return two authoritative nameservers, which then can be queried and
> return the MX record for zunft-oberstrass.ch.
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