Originally Posted by gmayor

If Outlook is your default e-mail application then Outlook is used to send e-mail, unless your application has its own custom e-mail function, in which case Outlook would not be involved.

You can check by switching Outlook not to send messages immediately, then send a message from your application. Does the message appear in Outbox?

Ads for the macro, did you change the two e-mail addresses to reflect what it is you are trying to do? Were there messages in the Outbox that reflected what you were trying to modify?