May 18, 2025 · May 18, 2025 · May 18, 2025 · May 19, 2025 · May 19, 2025 · May 19, 2025
diff --git a/Lib/email/_header_value_parser.py b/Lib/email/_header_value_parser.py
 def _check_for_early_dl_end(value, domain_literal):
    if value:
        return False
    domain_literal.append(errors.InvalidHeaderDefect(
    domain_literal.defects.append(errors.InvalidHeaderDefect(
        "end of input inside domain-literal"))
    domain_literal.append(ValueTerminal(']', 'domain-literal-end'))
    return True
diff --git a/Lib/test/test_email/test__header_value_parser.py b/Lib/test/test_email/test__header_value_parser.py
            )
        self.assertEqual(message_id.token_type, 'message-id')

    def test_parse_message_id_with_invalid_domain(self):
        message_id = parser.parse_message_id("<T@[")
        self.assertEqual(message_id.token_type, 'message-id')
        self.assertEqual(str(message_id.all_defects[-1]),
                         "end of input inside domain-literal")

    def test_parse_message_id_with_remaining(self):
        message_id = self._test_parse_x(
            parser.parse_message_id,
diff --git a/Misc/NEWS.d/next/Library/2025-05-18-23-46-21.gh-issue-134152.30HwbX.rst b/Misc/NEWS.d/next/Library/2025-05-18-23-46-21.gh-issue-134152.30HwbX.rst
 :mod:`email`: Fix parsing of emails message ID with invalid domain.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -1573,7 +1573,7 @@ def get_dtext(value):
		def _check_for_early_dl_end(value, domain_literal):
		if value:
		return False
		domain_literal.append(errors.InvalidHeaderDefect(
		domain_literal.defects.append(errors.InvalidHeaderDefect(
		"end of input inside domain-literal"))
		domain_literal.append(ValueTerminal(']', 'domain-literal-end'))
		return True
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -2732,6 +2732,12 @@ def test_parse_valid_message_id(self):
		)
		self.assertEqual(message_id.token_type, 'message-id')

		def test_parse_message_id_with_invalid_domain(self):
		message_id = parser.parse_message_id("<T@[")
		self.assertEqual(message_id.token_type, 'message-id')
		self.assertEqual(str(message_id.all_defects[-1]),
		"end of input inside domain-literal")

		def test_parse_message_id_with_remaining(self):
		message_id = self._test_parse_x(
		parser.parse_message_id,
Expand Down
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		:mod:`email`: Fix parsing of emails message ID with invalid domain.