add

users-events/app/events/email_receiving.py

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+import urllib.parse as urllib_parse
+from email.utils import parseaddr
+
+from aws_lambda_powertools import Logger
+from aws_lambda_powertools.utilities.data_classes import SESEvent, event_source
+from aws_lambda_powertools.utilities.typing import LambdaContext
+from layercake.dynamodb import DynamoDBPersistenceLayer, KeyPair, SortKey
+
+from boto3clients import dynamodb_client
+from config import USER_TABLE
+from ses_utils import get_header_value
+
+logger = Logger(__name__)
+user_layer = DynamoDBPersistenceLayer(USER_TABLE, dynamodb_client)
+
+
+@logger.inject_lambda_context
+@event_source(data_class=SESEvent)
+def lambda_handler(event: SESEvent, context: LambdaContext) -> dict:
+    ses = event.record.ses
+    to = urllib_parse.unquote(ses.receipt.recipients[0]).lower()
+    name, email_from = parseaddr(get_header_value(ses.mail.headers, 'from'))
+
+    org_id = user_layer.collection.get_item(
+        KeyPair('email', SortKey(to, path_spec='user_id')),
+        raise_on_error=False,
+        default={},
+    )
+
+    if not org_id:
+        return {'disposition': 'STOP_RULE_SET'}
+
+    print(
+        {
+            'id': f'mailbox#{org_id}',
+            'sk': ses.mail.message_id,
+        }
+    )
+
+    return {'disposition': 'CONTINUE'}