Picasa feeds - are they valid sources for Notify.me?

Adding picasa feeds as a source doesn't seem to generate anything. For example, this is the feed of one of my public folders, which I've confirmed I can access without being logged into Google:
http://picasaweb.google.com/data/feed...

I've added it as a source to Notify.me, but I'm not getting any mail notifications when I post pictures (which updates the feed).

Could someone check this for me please?

Thanks,

J.