i dont know if this is related, but when i am trying to backup my iptables through cron it does back the file up but does not give me a confirmation e-mail. I think this is due to some kind of timeout, when you type "iptables - L" there is a short delay before the info is displayed and this delay is the only reason i can find on why cron is not giving me my e-mail confirmation (everything that has no delay works just fine)...maybe there is a timeout/delay in the e-mail you are sending out therefor cron wont do it. that just a guess though.
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