ItemSend event is not firing
问题 I have an Outlook 2007 Add-in (VSTO). Any mail sent with Outlook should be modified before that. I use the Application.ItemSend event and it works fine if I send an email directly from Outlook ( Inspector ) or through a custom C# application that uses the Send method of the MailItem . However, there is some external application that uses Outlook to send mails - which does not trigger the ItemSend event at all. The mail is moved directly to the Outbox ( I can even catch the event of ItemAdd on