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I’m currently putting the finishing touches to an application for a client, this application sends daily emails to subscribers, is it possible to add custom headers to the email so that certain variables can be tracked, like day number (X-Day-Number) etc…
There isn’t a documented way to do it. Perhaps you should suggest it on the issue tracker.
http://code.google.com/p/googleappengine/issues/list
Of course, if you’re really determined, you can create your own email sending gateway on a more traditional server, and call its web service from App Engine.