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[jbbqqf]

Summary

tests/test_message.py::test_unicode_sender and
tests/test_message.py::test_unicode_sender_tuple were passing a sender with a
stray trailing > ("from@example.com>"). Python's email.utils.parseaddr
returns ('', '') for malformed inputs since the CVE-2023-27043 mitigation
landed in cpython 3.9.20, 3.10.15, 3.11.10, 3.12.6 and 3.13.0, so
sanitize_address produces an empty string and the From: header is silently
dropped on every supported Python interpreter. Both tests have failed since
those releases shipped.

Fix the inputs so they are well-formed addresses. The assertions already
expected a clean <from@example.com>, so no other change is needed.

Fixes #233.

What I ran locally

$ pytest tests/test_message.py -k 'test_unicode_sender' -v
tests/test_message.py::test_unicode_sender_tuple PASSED
tests/test_message.py::test_unicode_sender PASSED

$ pytest
51 passed in 0.09s

Reproduce BEFORE/AFTER yourself (copy-paste)

# --- one-time setup ---
git clone https://github.com/pallets-eco/flask-mail.git /tmp/fm-233 && cd /tmp/fm-233
python3.11 -m venv .venv && source .venv/bin/activate
pip install -e . pytest >/dev/null

# --- BEFORE: origin/main ---
git checkout origin/main
pytest tests/test_message.py -k 'test_unicode_sender' -v
# Expected: 2 failed (empty 'From:' header in msg.as_string())

# --- AFTER: this branch ---
git fetch https://github.com/jbbqqf/flask-mail.git fix/233-unicode-sender-test-inputs
git checkout FETCH_HEAD
pytest tests/test_message.py -k 'test_unicode_sender' -v
# Expected: 2 passed

Edge cases

#	Scenario	Input	Expected	Verified by
1	tuple sender, well-formed address	("ÄÜÖ → ✓", "from@example.com")	From: =?utf-8?b?w4TDnMOWIOKGkiDinJM=?= <from@example.com>	test_unicode_sender_tuple
2	string sender, well-formed address	"ÄÜÖ → ✓ <from@example.com>"	From: =?utf-8?b?w4TDnMOWIOKGkiDinJM=?= <from@example.com>	test_unicode_sender
3	string sender already containing <…> brackets	parseaddr returns ('ÄÜÖ → ✓', 'from@example.com')	name encoded, address ascii	test_unicode_headers (unchanged, still passing)

Risk / blast radius

Tests only — no runtime code path touched. The two assertions in the file
already encoded the well-formed expected output, so this aligns the inputs
with what the tests had always claimed to verify.

---

PR drafted with assistance from Claude Code (Anthropic). The change was
reviewed manually against flask-mail's source. The reproducer block above is
the one I used during development; reviewers can paste it verbatim.

[davidism]

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