MailManager Update: Allow underscores in the local part of the input of the "Email recipients rewrite" action in rule sets.

Author: AWS

.changes/next-release/feature-MailManager-a576069.json

@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "MailManager",
+    "contributor": "",
+    "description": "Allow underscores in the local part of the input of the \"Email recipients rewrite\" action in rule sets."
+}