An SMTP relay could make a copy of your emails before they even reach your inbox. Lack of TLS support on the sender side and the context goes clear text through relays. Encryption remains the best way to guarantee against eavesdropping.
At some point when the number of boxes and number of cronjobs become too high, I suggest looking at Rundeck as a central scheduler (not affiliated with PagerDuty, I actually work for a competiting company) or something similar.
Also, you want to make sure your job has been running. I've used a selfhosted instance of healthchecks.io in order to warn me if something has not run.
I live in the French speaking part of Belgium and have configured all my devices in English for the past 15+ years.
Apparently Google consider that if you are geo IP located in Belgium with your devices in English, you _have to be_ a Dutch speaker. While I would agree that French speaking Belgians are in majority using French UIs, there are exceptions. Please respect my browser settings!
The solution? I have to put French in my browser accepted languages (not necessarily first) and then Google understand I'm not a Dutch speaker and will stick to English.