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gh-159350: Handle empty lists in strict email.utils.parseaddr #159351

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gh-159350: Handle empty lists in strict email.utils.parseaddr #159351

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2 changes: 2 additions & 0 deletions Lib/email/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -349,6 +349,8 @@ def parseaddr(addr, *, strict=True):
return addrs[0]

if isinstance(addr, list):
if not addr:
return ('', '')
addr = addr[0]

if not isinstance(addr, str):
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5 changes: 5 additions & 0 deletions Lib/test/test_email/test_email.py
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Expand Up @@ -3199,6 +3199,11 @@ def test_parseaddr_empty(self):
self.assertEqual(utils.parseaddr('<>'), ('', ''))
self.assertEqual(utils.formataddr(utils.parseaddr('<>')), '')

def test_parseaddr_empty_list(self):
for strict in (True, False):
with self.subTest(strict=strict):
self.assertEqual(utils.parseaddr([], strict=strict), ('', ''))

def test_parseaddr_multiple_domains(self):
self.assertEqual(
utils.parseaddr('a@b@c'),
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2026-10-13-20-45-00.gh-issue-159350.pArSad.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix :func:`email.utils.parseaddr` raising :exc:`IndexError` for an empty
list in strict mode. It now returns ``('', '')``, as in non-strict mode.
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