This guide elaborates how you see and measure your sign ups through campaigns, websites etc. The statisctics can be used in order to measure succes and it can give you insight as to whether someething needs to be changed.
When a subscriber is using Hotmail, Yahoo!Mail or TDC Webmail, and marks your newsletter as "Junk", Ubivox receives a notification stating that a subscriber has "complained" about receiving the newsletter. The subscriber is then, automatically, suspended from the list. This guide elaborates complaints and how they are handled in Ubivox.