https://bugs.exim.org/show_bug.cgi?id=2855
--- Comment #3 from Heiko Schlittermann <hs@???> ---
More facts: It happens behind a HAProxy, if the HAProxy sends the v4mapped
address. It doesn't seem to matter whether v1 or v2 protocol is in use.
The HAProxy uses v4mapped addresses once it binds to mixed(?) protocol sockets,
using `bind :::<port>` in its configuration.
Now I can work on a reproducer.
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