I wrote a scalable system for this: https://github.com/skx/overseer/ https://github.com/skx/overseer/ Handles SSL-checks, DNS-checks, SMTP-checks, & etc. Run

I wrote a scalable system for this: https://github.com/skx/overseer/ https://github.com/skx/overseer/ Handles SSL-checks, DNS-checks, SMTP-checks, & etc. Runs a thousand-checks every two minutes for me, give or take. Pluggable output via a redis-queue.