patchbomb: don't test ambiguous address
This is a bug in Python's `email` package and shouldn't be relied on.
Python 3.12 has fixed this problem¹ and raises an exception. We keep the
multiple `-t` because this is still relevant for testing.
[1] https://github.com/python/cpython/issues/102988
[2] https://docs.python.org/3/whatsnew/changelog.html
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