August 03, 2012, 5:29 PM — Apple removed RSS functionality from Mail in OS X Mountain Lion. Here's how you can recover your lost RSS feeds so you can use them in another RSS application.
1. Open a terminal window.
2. Type in the following command, then hit Enter:
cd ~/Library/Mail/V2/RSS/
3. Type in the following command, then hit Enter:
find . -name "Info.plist" -exec grep -A 1 Feed {} \; | grep string | sed 's/^[^>]*>//' | sed 's/]*>$//'
4. This will show your RSS feeds in a list inside the terminal window.
5. You can now add those RSS feeds to your preferred RSS app in OS X Mountain Lion.
It definitely sucks that Apple killed Mail's RSS functionality, but at least now you can recover your lost feed information.
For more, see the original article at the link below.
Finding your missing Mail.app RSS feeds | Macgasm
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