Greetings sabatro,
In order to delete mail from your Mac, follow these steps:
- "In the Mail app
on your Mac, select a message. - Click the Delete button
in the Mail toolbar or move the pointer over the message’s header, then click the Delete button that appears.
Tip: To prevent the next message in the list from being automatically selected (and marked as read), press and hold the Option key when you delete the message.
If you set the “Move discarded messages” option to Trash in Viewing settings in Mail, you can delete a message by swiping left on the trackpad with two fingers or by moving the pointer over a Mail notification, then clicking Delete (or the Trash icon)." Delete emails in Mail on Mac
We hope this helps!
Sincerely.