iCloud User Guide
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Delete email in Mail on iCloud.com
Deleted messages are moved to the Bin mailbox. After you delete a message, it is saved in your Bin for 30 days, after which it is permanently erased from the Bin. You can change where your deleted messages are stored so they are not permanently erased.
Delete email
In Mail on iCloud.com, select the message or messages you want to delete.
Do any of the following:
If you do not see the sidebar, see Show or hide the sidebar in Mail on iCloud.com.
Empty the Bin
Deleted emails are permanently erased from the Bin after 30 days. You can also empty the Bin manually if you want to erase all deleted emails sooner.
In Mail on iCloud.com, click
in the sidebar.
If you do not see the sidebar, see Show or hide the sidebar in Mail on iCloud.com.
Choose Empty Bin.
Erase emails immediately and permanently
You can set iCloud Mail to permanently and immediately erase messages when you delete them, instead of storing them in the Bin for 30 days.
In Mail on iCloud.com, click
in the sidebar, then choose Preferences.
If you do not see the sidebar, see Show or hide the sidebar in Mail on iCloud.com.
In the General pane, deselect “Move deleted messages to”, then click Done.
If you do not want your deleted emails to be permanently erased
By default, iCloud Mail moves messages to the Bin when you delete them, and messages in the Bin are erased permanently after 30 days. If you do not want your messages to be automatically erased after 30 days, you can have iCloud Mail move them to another folder.
In Mail on iCloud.com, click
in the sidebar, then choose Preferences.
If you do not see the sidebar, see Show or hide the sidebar in Mail on iCloud.com.
In the General pane, select “Move deleted messages to”, choose another folder from the menu, then click Done.
Note: You might run into storage issues if deleted messages are not erased permanently after 30 days. To make more space available in iCloud, see the Apple Support article Manage your iCloud storage.
To delete Mail folders, see Organise email with folders in Mail on iCloud.com.