1. I dunno
2. Hi,

   I suppose on your own server.
   So go to the shell, create file /tmp/email_content with the content of your e-mail and you can send it to all the people.

   cat /etc/passwd | cut -d: -f 1 |grep -v ^# |xargs mailx -s Subject < /tmp/email_content

   As one command.

   By using
   cat /etc/passwd | cut -d: -f 1 |grep -v ^#
   You can see the list of the users to whom you will send the mail.

Tags: linux security system, administration beginner guide linux