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Email sending script from address is invalid

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linux-howto

http://serverfault.com – i am sending email notifications from OSSEC active response script firewall-drop.sh, but when the email is sent through it, the FROM address is like this -@mydomain.com it should be ossec@mydomain.com or root@ossec.mydomain.com As the script is running from root. i have tried with different email clients, like mail, mutt, mailx, sendEmail and other python and perl based scripts, all of them add the "-" before @mydomain.com. What could be the reason? (HowTos)