How to: Programmatically create an email item
Applies to: 
Visual Studio 
Visual Studio for Mac
Note
This article applies to Visual Studio 2017. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here
This example creates an email message in Microsoft Office Outlook.
Applies to: The information in this topic applies to VSTO Add-in projects for Outlook. For more information, see Features available by Office application and project type.
Example
private void ThisAddIn_Startup(object sender, System.EventArgs e)
{
CreateMailItem();
}
private void CreateMailItem()
{
Outlook.MailItem mailItem = (Outlook.MailItem)
this.Application.CreateItem(Outlook.OlItemType.olMailItem);
mailItem.Subject = "This is the subject";
mailItem.To = "someone@example.com";
mailItem.Body = "This is the message.";
mailItem.Importance = Outlook.OlImportance.olImportanceLow;
mailItem.Display(false);
}