Please remove the phrase `No news is good news.` as it suggests to decide to go on with a bad operational habit.
Why I am stating this is because that `no news` also could mean that:
- your `cron` daemon stopped working,
- your MTA has issues (in case or mail notifications of course),
- anything in between the host running `acme.sh` and your client went wrong.
(... and probably you will not notice in time if `acme.sh` would otherwise send an error notification (if it runs anyway))
If you expect a daily mail (using `--notify-level 3`) you can always be sure that `acme.sh` has ran successfully before. You can also tick the `acme.sh` checkbox in the daily operational report of your enterprise. ;)