https://github.com/pyca/service-identity/issues/68
Index: src/service_identity/__init__.py
--- src/service_identity/__init__.py.orig
+++ src/service_identity/__init__.py
@@ -58,6 +58,9 @@ def __getattr__(name: str) -> str:
         return meta["Project-URL"].split(" ", 1)[1]

     if name == "__email__":
-        return meta["Author-email"].split("<", 1)[1].rstrip(">")
+        if "<" in meta["Author-email"]:
+            return meta["Author-email"].split("<", 1)[1].rstrip(">")
+        else:
+            return meta["Author-email"]

     return meta[dunder_to_metadata[name]]
