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https://issues.apache.org/jira/browse/JAMES-796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12512087
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Stefano Bagnara commented on JAMES-796:
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What I mean is that I'm not sure that such a patch would be correct and
compliant.
I'm not sure that you should ask for NS records (for a given domain) to a
server that already sent you empty MX records (for the same domain).
Why don't you simply point JAMES Server to a recursive server?
In order to decide whether to apply or not modifications to our dns client we
should collect informations from a dns expert to tell us exactly who is wrong
and what is the correct solution.
Maybe we use dnsjava the wrong way, maybe dnsjava is bugged or provide
incomplete resolutions (unlikely), maybe the server you are using is buggy.
IMHO before working on any patch we have to collect informations on the problem
and the correct approach to the fix.
> 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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