Knowledge Base Article
Outlook: A program is trying to automatically send e-mail on your behalf
Problem
When using a third-party application to send email, the message<br>
<pre>
A program is trying to automatically send e-mail on your
behalf.
Do you want to allow this?
If this is unexpected, it may be a virus and you should choose "No".
Yes No
</pre>
Solution
Use Express ClickYes. Somewhat cludgy, but it works well.