Find the spam folder in Gmail on a computer, Android, or iPhone, plus Outlook.com Junk Email and Yahoo Mail, and move wanted mail back to your inbox.

Gmail on a computer: in the left menu, click More, then Spam. Gmail app: tap Menu (three lines), then Spam. Outlook.com: open the Junk Email folder. Yahoo Mail: open More, then Spam.
If you find a message you wanted, mark it as Not spam (Outlook: It's not junk). That moves it back to your inbox. The steps for each service are below.
To move a message out of Spam:
The message moves to your inbox. Steps from Google's Mark or unmark spam in Gmail help page.
See Google's Android steps.
See Google's iPhone and iPad steps.
Outlook.com calls its spam folder Junk Email.
To keep future mail from that sender out of Junk, add the sender to your Safe senders list. If you blocked the sender by mistake, remove them from Blocked senders first.
Check Junk Email regularly. Microsoft says messages in it are automatically deleted between 10 and 30 days after they arrive. See Mail goes to the Junk folder by mistake.
Yahoo moves the message to your inbox, and future messages from that sender should go to the inbox too. Yahoo also advises against clicking links or images in the Spam folder. See Manage spam in Yahoo Mail.
in:anywhere followed by the sender or a word from the subject, for example in:anywhere invoice. Google says this operator includes Spam and Trash (Gmail search operators).If you deleted a message by mistake, see our guide to recovering deleted mail.
If customer or project emails keep getting lost, a shared board in Gmail can help. With Kanban Tasks, you can turn an important email into a task with a link back to the message, so the request stays visible after it leaves your inbox.
On a computer, it's under More in the left menu. In the Gmail app, tap Menu to see it.
Spam filters sometimes catch mail from senders you know. Mark the message as Not spam each time it happens. If it keeps happening, tell the sender, because the cause may be on their side.
Be careful. Spam can include phishing. Check the sender's address before you open links or attachments, and only mark a message as not spam when you trust the sender.