Ubivox collects detailed statistics from you newsletter that enables you to, subsequently, analyze the results from the specific newsletter. The guide elaborates what the different statistical data functions mean.
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.