I just finished adding a custom service to send an email on system
shutdown/startup:
<https://github.com/SpareSimian/bootmail>
I ended up coding an After for postfix.service on CentOS 8 so the mail
would get delivered before the system shut down. (I think I might need a
delay, too, to allow the message to finish shipping to the monitoring
server across the network.) I'd like to be able to use the same unit file
on older systems that use sendmail, and I know there are other packages
that provide SMTP and local mail. So it would be desirable to have an Alias
for those services. I'm using CentOS 8 on my latest system and 7 on older
systems. Is this perhaps already present in a newer systemd commit? Is
there a registry for well-known aliases for package writers? With
CentOS/RHEL/Fedora allowing multiple options for several packages through
its alternatives system, this seems like a natural need.
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