Hello Brian,
You forgot to list some other options again :)
>The best way since Microsft can change things whenever they want would be to bypass outlook altogether.
>You should consider an SMTP component that you could use to talk directly with the mail servers and send the messages completely bypassing and mail program the user has.
>
>SMTP Wizard is a great program for accomplishing this task and is currently used by a large number of developers all because of the new security features in Outlook.
>
Steve Gibson