Emailing a podcast from Music in iOS5 no longer works

The "Email" envelope icon in the Music app at one time allowed me to email a podcast URL to someone.

This icon no longer works for me. It is grayed out for every podcast.

I am using an iPhone 4 with iOS 5. Page 77 of the iOS 5 manual says this is the "Email" icon.

Someone asked this question back in 2010 (message number 11047865) and apparently, it is still broken two years later.