fix: avoid collapsing distinct authors with missing From header (CM-1318)

Signed-off-by: Uroš Marolt <uros@marolt.me>

Author: themarolt

services/apps/mailing_list_integration/src/crowdmail/services/parse/noteren.py

@@ -228,7 +228,11 @@ def parse_email(
     except ValueError:
         author = None
     if author is None:
-        author = "Unknown <unknown@kernel.org>"
+        # Synthesize a per-message identity keyed on git_id instead of a fixed
+        # placeholder — a shared "unknown@kernel.org" would otherwise collapse
+        # every unattributable message from distinct real authors into one
+        # member.
+        author = f"Unknown <unknown+{git_id}@kernel.org>"
     author_name, author_email = parse_author(author)
 
     # The b4 tool provides a relay for sending patches to the list, if it is

services/apps/mailing_list_integration/src/test/test_noteren.py

@@ -367,7 +367,7 @@ def parsebytes(self, message):
     monkeypatch.setattr(noteren, "get_body", lambda msg: "line\n")
     parsed = _parse_email(b"irrelevant", "src", "chan", "commit1", "blob1")
     assert parsed["activityData"]["member"]["displayName"] == "Unknown"
-    assert parsed["activityData"]["member"]["identities"][0]["value"] == "unknown@kernel.org"
+    assert parsed["activityData"]["member"]["identities"][0]["value"] == "unknown+commit1@kernel.org"
 
 
 def test_parse_id_writes_json(monkeypatch):