I have an RSS feed I'm monitoring for changes. Is there some web service that provides a way to be notified by email immediately** when a new post is added?
** When I say immediately, I mean within 1 - 2 minutes.
George, you need to check if the publisher's feed is pushing its RSS feed with some push protocol; PubSubHubbub for example.
You could also register to Superfeedr that handles pushed contents via PubSubHubbub, RSSCloud, XML-RPC or SUP.