[gte910h]

>u. No, deleting your emails programatically because you haven't got around to reading them is not a good idea

Archiving them is. You can't have more attention than you have. If people try to get more attention then you can give, you have to triage. Backloads of email are huge piles of stress, and you realistically will almost never get to them

Once you've done the emails you've chosen to handle, use a mail client with some form reply to process some things which that's amenable to handling, and archive that which isn't important beyond that.

You should ALSO work directly to stop getting CCed on so many things and to communicate with fewer exchanges on more important topics. Get co-workers to not bury the lede, and to get items which need your decision or action to very prominently feature that in the title and first line of the message.