[exim-dev] [Bug 2264] New: DNS lookups should not chase CNAM…

https://bugs.exim.org/show_bug.cgi?id=2264

            Bug ID: 2264
           Summary: DNS lookups should not chase CNAME loops
           Product: Exim
           Version: 4.91
          Hardware: All
                OS: All
            Status: NEW
          Severity: bug
          Priority: low
         Component: Networking
          Assignee: nigel@???
          Reporter: jgh146exb@???
                CC: exim-dev@???

Per the discussion starting
https://lists.dns-oarc.net/pipermail/dns-operations/2018-April/017449.html
we should trust that the resolver is doing the right thing, following CNAME
chains itself - meaning that a CNAME return from a CNAME lookup will always
be an infinite loop and should be treated as NODATA. The limited loop we
have can be removed so we do not hammer the resolver.

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