Flesh out the email implementation

src/utils/secret.py

@@ -0,0 +1,14 @@
+class SecretBox[T]:
+    """A helper abstraction for making sure secrets aren't leaked accidentally"""
+
+    def __init__(self, item: T):
+        self._item = item
+
+    def expose_secret(self) -> T:
+        return self._item
+
+    def __str__(self):
+        return '<SECRET>'
+
+    def __repr__(self):
+        return f'SecretBox<{type(self._item)}>'