Deleting messages From Mail
How do I erase emails stored on my hard drive that were earlier trashed??
iMac 21.5", macOS 10.14
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Here’s what Apple has documented:
Delete emails in Mail on Mac - Apple Support
Permanently delete emails
- In the Mail app
on your Mac, choose Mailbox > Erase Deleted Items, then choose an account. - You can also Control-click a Trash mailbox in the Mail sidebar, then choose Erase Deleted Items.
You can set the “Erase deleted messages” option in Mail preferences to have Mail permanently erase deleted messages for you at a specified time. See Change Mailbox Behaviors preferences.