How can I automatically delete all emails on a Gmail account the moment they arrive or are sent?
- In the search box click the down arrow.
- At the bottom of the search window, click Create filter with this search.
- Select Delete
- Create filter.
You can create a filter. I would go with
Does not have the words: and input something cryptic here. This will cover all incoming mails.
Then you need something for the outgoing. Here, I would search for the name of the gmail account.
Then there is an option to delete all messages to which the filter applies.