I use Gmail’s servers, and Outlook (Windows) as my mail client.
I occasionally get false positives identified as SPAM, requiring me to check my Spam folder regularly. When I see a legitimate e-mail in there, I always try to mark it as “Not junk” within the Outlook client, in the hope that this somehow has an action of “teaching” the junk identifying algorithm. It also has the effect of moving the message straight to the Inbox.
But does this actually have any lasting effect? Does Outlook actually pass the “not junk” identifier to Gmail? Is anything actually learned? If not, then what local effect does the action have. Because if nothing, then I may as well just move the messages to my Inbox directly.
