How is RSS different to email newsletter?
RSS is chosen by the user and can be from hundreds of different feeds. The user can choose the content they want and it will be delivered when it is available. Unsubscribing from RSS is instantaneous. An email newsletter gets sent to a mailbox and can be out of date before the reader gets to look at it. Unsubscribing is usually done at the server and can take a while for it to discontinue.
