Since RSS readers often present feeds and posts in the three-pane view often used in email clients, some email clients have naturally extended their capabilities to include RSS reading. While there was some RSS support in the 1.x series of the popular Evolution email/calendar/contact application, the recent 2.x release of Evolution has removed the RSS module. It is possible that Evolution 2.0 will be extended to include RSS support at some point again in the future.
