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Change `BccSelf` default to 0 for chatmail configurations and enable it upon a backup export. As for `DeleteServerAfter` who was set to 0 upon a backup export before, make its default dependent on `BccSelf` for chatmail. We don't need `BccSelf` for chatmail by default because we assume single-device use. Also `BccSelf` is needed for "classic" email accounts even if `DeleteServerAfter` is set to "immediately" to detect that a message was sent if SMTP server is slow to respond and connection is lost before receiving the status line which isn't a problem for chatmail servers.