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POUnable to change Mail HTML body from VSTO Outook 2007 add-in
 

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  1. POUnable to change Mail HTML body from VSTO Outook 2007 add-in
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    <p>The plot: </p> <p>I am creating an outlook 2007 add-in using VSTO and C# in Visual Studio 2010. The purpose of the add-in is to cause tracking of mails sent to customers. The add-in should insert a tracking code into every outbound mail that later enables it to be recognized and auto archived once the customer replies. My goal is to insert a tracking code as an attribute in the opening tag of the mail's HTML:</p> <pre><code>&lt;html tracking="ddfwer4w5c45cgx345gtg4g" ...&gt; </code></pre> <p>This will be done in the event handler of the Application.ItemSend event:</p> <pre><code>private void ThisAddIn_Startup(object sender, System.EventArgs e) { this.Application.ItemSend += new Microsoft.Office.Interop.Outlook.ApplicationEvents_11_ItemSendEventHandler(Application_ItemSend); } void Application_ItemSend(object Item, ref bool Cancel) { if (Item is Outlook.MailItem) { Outlook.MailItem mail = (Outlook.MailItem)Item; mail.HTMLBody = "&lt;html tracking=\"4w5te45yv5e6ye57j57jr6\" ..."; } } </code></pre> <p>The problem:</p> <p>It seem to never change the HTMLBody property. And it does not throw any exceptions. It just does nothing. I rewrote this logic directly in VBA in Outlook, and tried to change the HTMLBody, but it still did not change. How I know it did not change the HTMLBody is by stepping through and hovering over the property to see the current value. </p> <p>I am however able to make changes to the MailItem.Body property. But since I need to hide the tracking code in some way, the Body property does not help me at all. I also added the MailItem.Save() method after changing the HTMLBody property, but no change.</p> <p>I thought that perhaps the ItemSend event is to late and I can't change the HTMLBody at that time anymore, but I can't find any event like BeforeSend or alike. </p> <p>Any ideas would be much appreciated.</p>
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