It happens to even Google. If it's the same text you might be able to create a manual filter. In the end the issue might be that some big vendor is sending sim

It happens to even Google. If it's the same text you might be able to create a manual filter. In the end the issue might be that some big vendor is sending similar letters that are *not* spam, so some simple bayesian or even a NN can't mark it confidently as spam. There aren't enough words to describe how difficult the problem of spam really is.