There are a couple free services you can use with the RSS feed that is automatically generated by b2evolution. I have not specifically used any of these, but they should work).

http://shootthebreeze.net/blogalert/
http://www.feedburner.com/

with a little cut-and-paste programming you can use:
http://www.feed2mail.org/

I wrote an entire article about using RSS feeds to communicate in ways beyond blogreaders:
http://www.dizzysoft.com/index.php/2007/11/09/using_rss_in_the_church_2

Hope this helps.