add

users-events/app/ses_utils.py

@@ -0,0 +1,20 @@
+from typing import Any, Iterator
+
+from aws_lambda_powertools.utilities.data_classes.ses_event import SESMailHeader
+
+
+def get_header_value(
+    headers: Iterator[SESMailHeader],
+    header_name: str,
+    *,
+    default: Any = None,
+    raise_on_missing: bool = True,
+) -> str:
+    for header in headers:
+        if header.name.lower() == header_name:
+            return header.value
+
+    if raise_on_missing:
+        raise ValueError(f'{header_name} not found.')
+
+    return default