Received blank email from Cron Daemon

LE is installed on my email server and everything is working fine. I just received a blank email from the Cron Daemon with the subject line below. What caused this and do I need to do something?

“Cron <…@…> /opt/letsencrypt/certbot-auto renew --quiet”


Hi @LE-thanks

looks like you have configured a “special cron job” that sends such a mail.

Certbot is running two times per day.

So check your cron configuration.

I don’t remember ever receiving this email before and my only LE related cron is:
“36 3 * * * root /opt/letsencrypt/certbot-auto renew --quiet”

So I don’t think it’s running 2x per day. Unless I’m missing something?

When I check /var/log/letsencrypt/letsencrypt.log and …log.1, I see “…Cert not yet due for renewal” and “…no renewal failures”.

Hi @JuergenAuer

I got the same blank email again today. Any thoughts what I should be checking? Thanks.

2x per day is the standard setup.

I have no idea where you have configured that. Certbot doesn't send mails, normal cron jobs don't send mails.

Looks like you use additional tools to create these notifications -> find these and change or remove these.

This is a known bug which is fixed in git and scheduled for release on Monday.

1 Like

Thanks for letting me know.

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