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To create a Node.js event handler for the Outlook Add-In Item Send Event, follow these steps:

1. Open your Outlook Add-In project in Visual Studio or your preferred code editor.

2. Navigate to the Manifest.xml file and add the following code snippet to register the ItemSend event:

<Events>
    <Event Type="ItemSend" FunctionName="onItemSend" />
</Events>

1. In the .js file of your Add-In, define the onItemSend function:

function onItemSend(event) {
   // Handle the event logic here
}

1. To trigger the Node.js event handler when an email is sent, use the Office.context.mailbox.addHandlerAsync method to add the event handler:

Office.context.mailbox.addHandlerAsync(Office.EventType.ItemSend, onItemSend);

1. Save your changes and test the Outlook Add-In to ensure that the event handler is being triggered correctly when an email is sent.