Google App Engine doesn't allow for certain low level functionality essential to sending mail. In order to allow this plugin to work in the GAE sandbox, I've added the necessary functionality to send mail over the GAE Mail API.
I've also added a switch (USE_GAE_MAIL) that allows you to activate or not the Google functionality. Defaults to off to preserve compatibility.
Remarks welcome :)
Adding in Google app engine functionality
This is not the correct way to do it. You should create a Django e-mail sending backend and configure it in your settings.
Thanks for the effort, though. Maybe this will help: http://andialbrecht.de/blog/2009/11/04/pluggable-app-engine-e-mail-backends-for-django.html
Thanks for the info.
I suppose that this was a newbie kind of mistake, just trying to get everything to work for deploying my site.
I'll re-work it so that it's done properly (ie the django way) in the next few weeks, and publish as an egg so that no one else falls into that trap :).