Is it all of your incoming emails, or just from a certain sender? You need to provide better information about what is going on.
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It is several legitimate email addresses, including individual senders, newsletter distribution, and emails from mass mailings like my credit card company and paypal. There doesn't seem to be any logic to what's getting through and what's not. The other day I marked a bunch of them as not spam. Within 60 seconds they were pushed back into my spam folder. I cleared them again and they stayed. There are several senders that I have marked as NOT spam several days in a row that are still going into my spam folder. This is VERY frustrating.