Some spam messages won't die

Hi - Once in a while SpamSieve wil highlighted a significant number of messages as spam, but leave them in m inbox rather tha moving them to the Junk folder. When that happens. some one them reappear. Attached is an example. One of these has come back from the dead at least three times, and it’s the same message – I’m not getting new ones, based on the time stamp.

(1) What can I do to help SpamSieve move spam it has correctly identifies directly to the Junk folder 100% of the time?
(2) Are there ways to kill vampire spam messages that refuse to die when deleted?

(I can send a screen capture if that would help)

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