I am curious if I have something set up wrong...

I really don't know what RSS feeds are but... I have tried to set a few of them up in Mail...

1 of them works like I think they are supposed to I have 4 comics that I like to read and the comics are delivered daily to my "Comics" RSS feed

The rest of them don't work like I think they should... Space.com Washingtonpost.com & others It just gives me a preview of an article and I have to click a link to read it in Safari...

Is there a way to set it up so that the articles are actually delivered to my Inbox like my comics are?

Thanks