RSS and the email

how does the RSS over take email.
how can it be possible for the rss to replace emails?

No. RSS cannot replace email. Both RSS and Emails are different mediums to reach your target audience. Email would be a personalized way to reach while RSS is somthing like broadcasting.

Although majoritively I agree with born2optimise, I'm starting to see RSS take over from e-mail for certain things, noteably announcement-type tasks.

I've been setting up RSS feeds of new jobs for some recruitment sites, and less people are signing up for the e-mail version now the RSS is up and running as they grab that instead.

For the foreseeable future, I think it's sensible to offer both e-mail and RSS for a lot of announcements as the whole feeds area is very confusing for a lot of people at the moment. Once IE7 is out this may change a bit as it'll have a feed reader built in, which will bring feeds in to the consciousness of a lot more people.

please provide some more information regarding this matter,
because what i think is RSS can avoid spamimg, but its reachibility to the new customers to the particilar niche would be less when compared to mails.

mails can become spam but they can reach to new segments in fact which one whould you think are the better way to approach.

As a developer, my general answer to "which one" is "both." If your content is in a CMS of any kind (even a really simple one) then it's easy to write a script to create an RSS feed advertising the latest content. Even if you have to make the feed manually with a bit of cut and paste, it's a very simple job once you've got the basic file set up.

The RSS feed will capture the early adopter market. From what I can see from spider activity, MSN is really going for RSS in a big way - spidering them all the time, so you'll potentially get really fast inclusion of new content in to MSN at least.

However, 99.99% of the web-using population have got their own e-mail address and will understand signing up for a newsletter, so if I could only do one of the two, I'd do an opt-in e-mail system because you'll get the largest general market. OK, some of the messages might get lost to spam filters, but lots of them will get through and you're going for such a wide market you'll get through to more people than the feed would.

If your target market is technical people, or maybe journalists, I'd go for the feed, because they are the people who understand it. If you want the general web population, go for e-mail (and of course, a nice website.) For best results, do both.