RSS/Atom feed for incoming mail

Gmail currently provides RSS/Atom feeds of the user's inbox. I believe they use SSI with the user's standard username/password to protect the feed.

It would be great if GMX could do similar. But because GMX uses folders, GMX should provide a feed of "All incoming mail" instead of "Inbox only", otherwise email that gets moved to other folders using user-defined filters wouldn't show up in the feed.

Thanks.