iCloud User Guide
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Manage junk mail in Mail on iCloud.com
Most junk mail (spam) sent to your @icloud.com address or its aliases is automatically identified and moved to your Junk folder. If you receive unwanted email, you can manually mark it as junk by dragging it to the Junk folder. Messages marked as junk are displayed with a junk mail icon 
.
Important: Because messages in the Junk folder are automatically deleted after 30 days, periodically check the Junk folder for messages that were mistakenly marked as junk.
Mark an email as junk
In Mail on iCloud.com, locate the message list and select the message or messages you want to mark as junk.
Do one of the following:
Click
, then choose Move to Junk.Click
, then choose the Junk folder.Drag the message or messages to the Junk folder in the sidebar.
If you don’t see the sidebar, see Show or hide the sidebar in Mail on iCloud.com.
Subsequent messages from the same sender are automatically marked as junk.
Indicate that an email isn’t junk
In Mail on iCloud.com, click the Junk folder in the sidebar.
If you don’t see the sidebar, see Show or hide the sidebar in Mail on iCloud.com.
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.
Delete junk mail
By default, messages in the Junk folder are deleted after 30 days. To free up iCloud storage space before those 30 days, you can manually delete messages in the Junk folder at any time.
In Mail on iCloud.com, click the Junk folder in the sidebar.
If you don’t see the sidebar, see Show or hide the sidebar in Mail on iCloud.com.
Do one of the following:
Select the message or messages you want to delete, then click
in the toolbar.
If you don’t see
in the toolbar, click 
in the sidebar, then choose Preferences. In the General pane, deselect “Show Archive icon in the toolbar.”Drag the message to the Trash in the sidebar.
Select the message or messages you want to delete, then press the Delete or Backspace key.