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: [email protected]
Reporter: [email protected]
CC: [email protected]
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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