What do you mean? There was no M1 system in 2018. Only the Intel machine with cooling problems.
My MBP M1 Pro is usually compiling big chunks of software. (Granted, not as intense as rendering video but definitely more challenging than most games) three to four times as fast as my desktop i9, and after almost 2 years, I have yet to see it reach 40°C. It’s got some hefty fans that simply never have turned on yet, as far as I’m aware.
If you want to host email on your raspberry at home, your main issue is usually that your IP will be in a known „dial-up“ IP range, that is blocked by all major email providers. And most home internet providers block port 25 too. And you need a fixed IP, it’s a nightmare if your mail server‘s ip ever changes.
This is also a problem for ARM servers. Oracle's free tier is quite generous, especially if you use their free ARM offering (4 * 1 core with 6GB of RAM, no time limit on the free offering), but you can't run Mailcow on it.
This has been flagged on Github and the dev's response was "well, don't run anything important on a free server" and that was basically the end of that. I was pretty disappointed with that, but on the other hand there's nothing that prevents you from building the images yourself on ARM.
My MBP M1 Pro is usually compiling big chunks of software. (Granted, not as intense as rendering video but definitely more challenging than most games) three to four times as fast as my desktop i9, and after almost 2 years, I have yet to see it reach 40°C. It’s got some hefty fans that simply never have turned on yet, as far as I’m aware.