mail from: field question

Jim Bow jimbow at
Tue Jan 8 02:26:05 PST 2008

Hi all,

I have a small shell script that does a backup to a usb drive and emails 
the results to a set of people. The script is triggered from devd (upon 
drive attachment) and runs as root.

The problem is that the mail report is sent from an active system user 
and not user root. The user the mail is sent from is not referenced in 
the script. The mail line looks like this:

    cat $LOGFILE | mail -s "backuptousb report" recipient at

I find this rather confusing since I was expecting the email to be sent 
by the user running the script. How can this be?

A little research told me that this may be because of something called 
envelope-from, but I found little explanation of what that actually 
means. Anyone have any suggestions?



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