Install and configure your favorite mail server. Depending on your needs, this could be something simple like nullmailer (recommended) or something more complex like exim4.
I don understand by the OS itself...can give any examples of it?
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http://tombuntu.com/index.php/2008/10/21/sending-email-from-your-system-with-ssmtp/
Hi
Why don't you search for null mailer and Ubuntu in stead of other solutions...
You have to install it on your existing server since that is the one you need sending mails...
Regards,
Lysemose
sorry..is this better..
http://tombuntu.com/index.php/2008/10/21/sending-email-from-your-system-with-ssmtp/
sudo apt-get install nullmailer
# edit /etc/mailname to hold your "from" domain name. (If you were google, you'd use "gmail.com".)
# edit /etc/nullmailer/adminaddr to contain the address you want mail to root to be routed to.
# edit /etc/nullmailer/remotes to contain the mail server to forward email to.