In the on - line marketing the statistics and data are very important, because they show the level of interest of consumers. Consumers must become interested in your products. The easiest way to check it is to use the email open rate benchmarks. How does it work? Firstly, we must emphasise that the basis of the internet marketing is the mass dispatch of newsletters or advertisments via email. If this message looks interesting, there is the bigger chance that the receiver (potential client) will open it and enjoy the offer. Creating and sending newsletters is possible thanks to the Freshmail programme. But users of this tool should also take advanatage of other tools that will be able to show, how this mass dispatch is effective. One of these tools are the email open rate benchmarks. Shortly speaking, it is some king of the juxtaposition showing the ratio between opened (read) messages and sent emails. Thanks to this, the customer can register, how atteactive and effective are his marketing newsletters.