What exactly does “continue with next filter” mean? Does it reject the decision of the present filter?
It depends on the next filter in the priority list. When an e-mail is passed from one filter to another, it’s “probability” of being spam is passed along with the e-mail’s header and body text. So, a plugin could use this information to help with its filtering, but it’s difficult to know how many plugins (if any) actually do it. Most filter plugins don’t use that info. They just ignore what another filter has decided. The reason behind this decision is that if the message gets to the next filter, then the previous filters were not sure about it.
