I haven't tried that WSO for posting. Automating posting to Blogspot often depends on the tool you use to create the post. Test in small batches and combinations of tools and you might find something that works for your system.

I do use Smart Auto Blogger for posting to WP blogs. It works great with black hole feeds as content - after several hours of coding tweaks to get rid of footprints and gibberish.

I like Pete's programs however they are missing a couple fundamental issues: lack of standard data input files and poor updating/admin setup.

An ideal program takes a csv or text file filled with lines like:

username,password,email,title,content,rss

and then when the program is done you get a saved file with all your details like:

username,password,login,url,rssfeed

Any form that needs to be filled out with copy and paste can also be designed to run from a source text file.

The point I am getting at is some of the blogspot creator programs give you all the details you need to auto post to them and some don't. It takes more time to locate those details, login into email accounts and activate accounts than it's worth.