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When you select an RSS feed (or a mailbox containing more than one
feed), the articles appear in your message list, just as if they were
email messages. You can read, forward, delete, and move them in exactly
the same way, too; rules and smart mailboxes also work with RSS
articles. If you want to mark all the posts currently visible as read,
click on the pop-up Action () menu at the bottom of the window—or
Control-click (right-click)—on the feed or mailbox icon—and choose Mark
All Messages as Read.
Tip:
DISAPPEARING RSS FEEDS?
On a couple of occasions, I've opened Mail to find the entire RSS category mysteriously missing from the sidebar. According to some online discussion forums, numerous other users have had the same problem. If this happens to you, try either of these cures:
Choose File > Add RSS Feeds, and then click Cancel.
Quit Mail. Go to the .Mac pane of System Preferences and click Sync. Uncheck Synchronize with .Mac and reopen Mail. If the feeds are back, you can return to the .Mac preference pane and re-enable synchronization.