Add Recipient Email Address (#25671)

Co-authored-by: Fanrui Sun <[email protected]>

Author: 2 people

specification/eventgrid/data-plane/Microsoft.Communication/stable/2018-01-01/AzureCommunicationServices.json

@@ -615,6 +615,10 @@
           "description": "The Sender Email Address",
           "type": "string"
         },
+        "recipient": {
+          "description": "The Recipient Email Address",
+          "type": "string"
+        },
         "messageId": {
           "description": "The Id of the email that has been sent",
           "type": "string"