I no longer need to see So many useless emails that I would normally have to sift through in order to check for useful emails, instead this service correctly categorizes advertisements unlike gmail Review collected by and hosted on G2.com.

The most useful features require a paid account. While this is of course acceptable, as it is costly to run the service, people would be more inclined to try the service if they can try the features you're asking them to pay money for. Review collected by and hosted on G2.com.