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Sat, Jun 10, 2017 8:18 pm

Automated email for Let's Encrypt certificate expiration

The Let's Encrypt certificate I use for an email server again wasn't automatically renewed - see Let's Encrypt certificate expired. The Let's Encrypt certificates exipre every 90 days, so I wanted the system to automatically email me a message at least a week before the certificate expires. I manually renewed the certificate today by running the command letsencrypt renew from the root account and checked the new expiration date with the command openssl x509 -enddate -noout -i cert_pem_file_location where cert_pem_file_location is the location of the relevant cert.pem file.

# openssl x509 -enddate -noout -in /etc/letsencrypt/live/moonpoint.com/cert.pem
notAfter=Sep  8 19:14:00 2017 GMT
#

Since the new certificate expiration date is September 8, 2017, I wanted an email notice sent to me on September 1. I can then manually renew the certificate, if needed. I would then want to be notified every 3 months again indefinitely. Since the mailx utility is a standard email program found on Linux and OS X/macOS systems, I use it for sending scheduled email messages.

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