James Jrumbly of The Email Guide was curious about what exactly gets through from email marketers to Yahoo users. So he decided to use Yahoo’s email visualization tool and learned quite a bit about the subject.
This is a pretty damn good tool, and one of the things he noted is that almost 100,000 emails a second are delivered through Yahoo’s email systems.
So, how much exactly gets through spam filters? Quite a bit it seems. Most importantly, despite what people say, the keyword “FREE” is not actually blocked by Yahoo email, and all the weird variations such as F.R.E.E. and FWEE are also blocked.
Why? Because IP address, sender and message content are much more important than the subject lines in determining what is spam.