PubHTML5 offers the Newsletter function for users to receive emails about new version updates (including Desktop Client and Online Services) and promotion deals. We promise to send maximum of one per week and no any ads. However, if you think that it is unnecessary to receive the emails, you can unsubscribe newsletters from PubHTML5.
Click "Settings" -> "Notifications" -> "Newsletter". Click the button form "ON" to "OFF". Finish by "Save Changes".