fix email_formatting

pyproject_metadata/__init__.py

@@ -9,6 +9,7 @@
 import os.path
 import pathlib
 import typing
+from email.utils import formataddr
 
 
 if typing.TYPE_CHECKING:
@@ -319,11 +320,11 @@ def _name_list(self, people: list[tuple[str, str]]) -> str:
         )
 
     def _email_list(self, people: list[tuple[str, str]]) -> str:
-        return ', '.join([
-            '{}{}'.format(name, f' <{_email}>' if _email else '')
+        return ', '.join(
+            formataddr((name, _email))
             for name, _email in people
             if _email
-        ])
+        )
 
     def _build_extra_req(
         self,

tests/test_rfc822.py

@@ -167,3 +167,28 @@ def test_convert_optional_dependencies():
         'foo; (os_name == "nt" or sys_platform == "win32") and extra == "test"',
         'bar; os_name == "posix" and sys_platform == "linux" and extra == "test"',
     ]
+
+
+def test_convert_author_email():
+    metadata = pyproject_metadata.StandardMetadata.from_pyproject(
+        {
+            'project': {
+                'name': 'example',
+                'version': '0.1.0',
+                'authors': [
+                    {
+                        'name': 'John Doe, Inc.',
+                        'email': '[email protected]',
+                    },
+                    {
+                        'name': 'Kate Doe, LLC.',
+                        'email': '[email protected]',
+                    }
+                ],
+            },
+        }
+    )
+    message = metadata.as_rfc822()
+    assert message.headers['Author-Email'] == [
+        '"John Doe, Inc." <[email protected]>, "Kate Doe, LLC." <[email protected]>'
+    ]