This change was partly reverted in https://github.com/sudo-project/sudo/commit/9757d29a24ac1872872cf09757b0439c54089707 https://github.com/sudo-project/sudo/com

This change was partly reverted in https://github.com/sudo-project/sudo/commit/9757d29a24ac1872872cf09757b0439c54089707 https://github.com/sudo-project/sudo/commit/9757d29a24ac1872... TL;DR: Only display the warning if sudo is configured to send emails.