Sometimes mail goes into junk filter without doing anything, I have gotten forum emails in junk when using the gmail app on my android phone occassionally. Sometimes it is the subject of the mail or the contents as well. One thing that may work if you start seeing the problem is reset the settings back to factory default (after noting what your rules/filters) looks like, and recreating them. It is a PITA, but resetting back like that often allows you to get it working again.
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