Messages marked as junk are displayed with a junk mail icon:
Because messages in the Junk folder are automatically deleted after 30 days, periodically check the Junk folder for messages that were marked as junk mistakenly.
Click the Junk folder in the sidebar.
Select the message or messages, then click the Not Junk button in the top right of the message window.
The message is moved to your Inbox. Subsequent messages from the same sender are no longer automatically marked as junk.
You can set up rules to automatically filter incoming messages or reorganize messages you’ve already received using Mail on iCloud.com.
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To add another rule, repeat steps 2 and 3.
If you have multiple rules, they’re applied in the order in which they appear in the Rules list. To change the order, drag a rule up or down in the list. You can have up to 500 rules.
Click Done.
Important: If you apply rules to a folder and then delete the folder or change its name, make sure to update the rules for those folders accordingly. For example, you can’t forward messages to a deleted folder.