Sendmail and Mailertable
I currently have my MX records point to Linux box running FC4, sendmail. Rather than use an internal DNS to forward email to my exchange server I use the mailertable function.
This obviously forwards on all my NDR attacks which I want to stop! I have been monitoring the addresses used for NDR and feel I can remove 90% by adding just a few addresses.
Is there anything that I can do on my linux machine before the email is forwarded to my exchange server.
I originally wanted to put something in /etc/alias so that certain emails where sent to /dev/null but get the feeling that this isn't even used.
Anyone got any solutions for this, otherwise I will have to look at sorting this out on the Exchange side
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