mail to all users on a system (from root)

[Aslak Evang]

I've searched for ways for root to email all users on a system. The only
easy solution I found included making a shellscript and setting it as an
alias for "everybody". Problem was that in the script you had to insert
all your users manually.
Does anybody know of other methods for sending announcements to all
users on a system? Could have done it with MOTD but few of them actually
log-in. Most just read mail.

suggestions?

- Aslak

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