If that is your issue, then a better way is to have your own server, encrypt your emails and ask your contacts to do also. Once your mails are hosted once on a

If that is your issue, then a better way is to have your own server, encrypt your emails and ask your contacts to do also. Once your mails are hosted once on a server, you can't know where you data goes and how long it stays there. One minute is more than enough to archive an email on a warehouse.