Sounds like you should be able to make an adaptor for these?
That would be a nice service. You get an email address, which you use to sign up to news, and the service converts the most promising links in the emails into rss.
Good idea, but requires a lot of manual work. Because I suspect that you don't only receive updates, but also some salesy stuff. Might be easier to write a crawler for blogs or websites that don't offer RSS.
More and more sites are dropping their feeds and replacing them with their stupid 'sign up via email to receive updates' nonsense.