https://bugs.exim.org/show_bug.cgi?id=2804
--- Comment #1 from Simon Arlott <bugzilla.exim.simon@???> ---
It looks like Exim has been doing this since at least 2004.
When Exim encounters multiple header lines (not just a single header on
multiple lines) it is documented as inserting a newline between each header.
That would make it impossible to determine where each header begins, e.g.:
Subject: test1
test2
Subject: test3
test4
This would mean that "$h_Subject:" expands to "test1\ntest2\ntest3\ntest4" when
it should be "test1 test2\ntest3 test4".
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