New answers tagged gmail-labels
Categories are tabs you can have display in your Inbox to help you organize your incoming messages automatically. You can almost also treat them like labels. Labels are "tags" you put on messages. You have to explicitly put the label(s) on a message (or conversation) explicitly, either through direct action or via a filter. Categories, on the other had, ...
There's a possibility that the email has been classified as "Promotion" or "Update" and hence not showing the main inbox. Maybe you can consider switching off this classification. Go to Gmail Settings -> Inbox and set the type as Default and choose the categories that should be displayed.
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