Hostname and mail configurations in Linux

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By default mail command will set the from address as $user@$hostname in Linux. If you want to change this behavior using the configuration file (/etc/mail.rc ) this is how it can be done.

Set the entire from address like below.

Add this to the configuration file.
set from="from address"

If you need to change the hostname part only, add this.
set hostname="hostname"

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