Apparently Blogger's spam filters are an ever changing algorithm that gets better over time. So it looks like your options are to categorize each post as spam, so the filters get smarter, or turn off posts altogether. Because of the word verification system, pretty much all "bot" spam is filtered out, so the people leaving irrelevant messages are singling you out, probably among others.
I read this recently:
ReplyDeletehttp://blogging.nitecruzr.net/2011/02/comment-filtering-and-spam-content-is.html
Apparently Blogger's spam filters are an ever changing algorithm that gets better over time. So it looks like your options are to categorize each post as spam, so the filters get smarter, or turn off posts altogether. Because of the word verification system, pretty much all "bot" spam is filtered out, so the people leaving irrelevant messages are singling you out, probably among others.
Good luck!