Follow this instruction
first step:
+ you should already have blogspot of course...:D
Step 2:
+ Login with your gmail account on your blogspot dashboard, and go to Setting and choose email and mobile tab.[preview screen are below]
Notice: when you choose "POSTING OPTION" you should supply your email blogger, for this example " kunthi3.saya@blogger.com" [based on the picture above] and it means the blog will start posting automaticly with this secret email.If you done with this step now you just need to find a appropriate RSS feed that suitable with your blog content.
Step 3:
+ Next you should to is go to this url: FeedMyInbox.com[+]
complete all field that requested, like
Enter a website URL : http://preview-shopping.blogspot.com
Enter your Email Address : kunthi3.saya@blogger.com [based on step 2]
Done......!!!, plus minus of using this method is your blog content will exactly same with the blog from the Rss Feed that you taken and of course it much timesaving when you do posting, but also Google doesn't like that[ if you running Google Adsense on your blog advertisement]