When I couldn’t see certain mail sent to my Gmail account, I thought the sender had made a mistake with my Gmail address. When they assured me it had been correctly addressed, it dawned on me that it must have been treated as spam, but where was the Spam folder?
It appears the Spam folder is not shown by default and has to be enabled if you want to see it. Here’s how:
Hover the mouse over a folder name in the left column. This reveals all the possible folder options.
In this example, the highlighted folders are the ones I see by default and by choice. If Spam is not highlighted, click the name to see the folder contents.
If you decide that a mail item isn’t spam, click the check box next to the item. Then select the Not spam button. The item will move automatically to your Inbox.
If you want to have the Spam folder available permanently, you need to select the gear icon in the upper right corner. Click on Settings from the dropdown list, and then the Labels tab.
Choose show or show if unread.