Failures in t9001-send-email

[Alyssa Ross <hi@alyssa.is>]

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> I think a patch to do that would be worth having/reviewing (hint
> hint!). As always the real work is updating docs, running the tests
> etc., digging up ML discussions to see if there's been any past
> arguments for/against it etc.
>
> In this case the code change itself should be trivial (I honestly didn't
> look this time, but really, it's a config default...). So this seems
> like a perfect task for someone not too familiar with Git's codebase,
> but still interested in contributing :)

I thought I'd have a go at a patch, but I wasn't able to get the tests
running:

    prove ./t9001-send-email.sh
    ./t9001-send-email.sh .. Dubious, test returned 1 (wstat 256, 0x100)
    Failed 15/188 subtests
      (less 1 skipped subtest: 172 okay)

    Test Summary Report
    -------------------
    ./t9001-send-email.sh (Wstat: 256 Tests: 188 Failed: 15)
      Failed tests:  27, 51, 78-84, 123, 147-150, 185
      Non-zero exit status: 1
    Files=1, Tests=188, 17 wallclock secs ( 0.06 usr  0.01 sys + 11.66 cusr  5.37 csys = 17.10 CPU)
    Result: FAIL

I had a look at the tests to try to guess what was wrong, but I didn't
come up with anything.  Any ideas?  When I run make test, every other
test is fine, it's just the send-email tests that are problematic.

(My git source tree is v2.36.0.)

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