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You get a useless use of cat award (http://partmaps.org/era/unix/award.html).

mailx user@some.machine < file

Sure. Eg, block anything not comming from the 192.168.0.0/24 network:iptables -I INPUT 1 '!' --src 192.168.0.0/24 -j DROP

For a larger list it's probably better to create a special chain:...

When the -f option is used, there is no confirmation prompting. Use the real rm command and not an alias or something:
/usr/bin/rm -rf ...