Recently active topics in SlideShare tagged with email

When I am not logged in to Slideshare or others are not, the email to share a slideshow with a friend appears to be processed but never goes though to the recipient. If I am logged in the email reaches it's destination just fine. Why won't it go through when shared by a guest, even if they fill out the form correctly, including special characters, etc. This may not be a problem when sharing from within the player itself. But it never works when using the Share link on the webpage even though it looks like everything works and a confirmation message is provided.

Still having problems with getting notification emails after I've said I don't want any... I still get the " the following topic in the 'x' group on SlideShare has been posted' or 'so and so has uploaded a post to x group'.

I hate to complain since I do love the site and its UI, but pleeeease make it stop. I've set my email notifications to none in my profile, but Sunday I got three notifications. Help.