I’m reading the Apple KnowledgeBase note for the Mac OS X 10.3.3 update. I have not yet installed it, but I am thrilled to read this bullet item.
Addresses an issue in which Mail could unexpectedly quit when marking some types of unsolicited messages (or “spam”) as Junk.
I haven’t been hit by this problem for some time, but sure would be pleased to know it’s gone forever.