How to: Programmatically perform actions when an email message is received
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 performs custom actions when the user receives an email message.
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
Dim outlookNameSpace As Outlook.NameSpace
Dim inbox As Outlook.MAPIFolder
Dim WithEvents items As Outlook.Items
Private Sub ThisAddIn_Startup() Handles Me.Startup
outlookNameSpace = Me.Application.GetNamespace("MAPI")
inbox = _
outlookNameSpace.GetDefaultFolder( _
Outlook.OlDefaultFolders.olFolderInbox)
items = inbox.Items
End Sub
Private Sub Items_ItemAdd(ByVal item As Object) Handles items.ItemAdd
Dim filter As String = "USED CARS"
If TypeOf (item) Is Outlook.MailItem Then
Dim mail As Outlook.MailItem = item
If mail.MessageClass = "IPM.Note" And _
mail.Subject.ToUpper.Contains(filter.ToUpper) Then
mail.Move(outlookNameSpace.GetDefaultFolder( _
Outlook.OlDefaultFolders.olFolderJunk))
End If
End If
End Sub
Outlook.NameSpace outlookNameSpace;
Outlook.MAPIFolder inbox;
Outlook.Items items;
private void ThisAddIn_Startup(object sender, System.EventArgs e)
{
outlookNameSpace = this.Application.GetNamespace("MAPI");
inbox = outlookNameSpace.GetDefaultFolder(
Microsoft.Office.Interop.Outlook.
OlDefaultFolders.olFolderInbox);
items = inbox.Items;
items.ItemAdd +=
new Outlook.ItemsEvents_ItemAddEventHandler(items_ItemAdd);
}
void items_ItemAdd(object Item)
{
string filter = "USED CARS";
Outlook.MailItem mail = (Outlook.MailItem)Item;
if (Item != null)
{
if (mail.MessageClass == "IPM.Note" &&
mail.Subject.ToUpper().Contains(filter.ToUpper()))
{
mail.Move(outlookNameSpace.GetDefaultFolder(
Microsoft.Office.Interop.Outlook.
OlDefaultFolders.olFolderJunk));
}
}
}