ntfy is cross platform and i can share alert with all family members without compatibility problem.

I use for alert me end of linux script ou longest command.

I use for alerting me when my supervision detect DOWN …

It’s a great tool

But i don’t self hosted the server side because ntfy work perfect at this time

I use mailjet with tls on port 465 for all self hosted

it provides me with end-to-end security and ensures that emails arrive at the correct destination, it's much less burdensome to manage

Is free over 6000 mails / month (200 days)