In a moment of madness, or just with a taste for adventure djberg96 downloaded and tried out my new module, as mentioned yesterday. After highlighting a few issues and clarifing a few points I've been able to upload a new version.
I'm still trying to figure out if there is a way I can get the script to register itself as a legimate user of Outlook, but I suspect not. That might make it too easy for spammers. Still at least it automates most of the message building & sending, even if it does require you to confirm that's what you want to do.
I plan to see if this works with Outlook Express, or whether I'll have to add a bit extra.