> For those who would like to continue receiving expiration notifications, we recommend using a third party service such as Red Sift Certificates Lite (formerly Hardenize). Red Sift’s monitoring service providing expiration emails is free of charge for up to 250 certificates. More monitoring options can be found here.
I don't think this is nearly as effective of a solution. It stops working if the script is crashing before hitting the notification, it doesn't work if you break your email setup (which for an email that almost never sends is likely to go unnoticed forever) it also fails if you accidentally stop running a script or remove the certificate from your config entirely.
> For those who would like to continue receiving expiration notifications, we recommend using a third party service such as Red Sift Certificates Lite (formerly Hardenize). Red Sift’s monitoring service providing expiration emails is free of charge for up to 250 certificates. More monitoring options can be found here.