Connecting devices for simultaneous email deletion
How do I connect additional devices so that I can delete emails from all my devices at once?
[Re-Titled by Moderator]
iPhone 11 Pro Max
If your email account is IMAP or Exchange, just connect each of your devices to the account and then when you delete or move a message on one device, the same will have happened on every device. If your email account is POP, then you will need to delete the messages individually on each device (since each device will have downloaded the message separately; that's how POP works).
Regards.