In Firefox, the solution is easy. Simply type about:config in the address bar and set network.proxy.socks_remote_dns to true. This will have the remote end (i.e., the machine you are SSH’ing to) handle the DNS lookups.

at now +10 minutes <<< "rm -rf /tmp/tobedeleted"

at now +1 minutes <<< "init 6"

/etc/init.d/networking stop && /etc/init.d/networking start

atq

atrm 2

For multiline, consider a "HERE-doc"

at now +10 minutes <<ENDMARKER
rm -rf /tmp/tobedeleted
echo all done | mail -s 'completion notification' sysadmin@example.com
ENDMARKER