Generally just go with more known brands of motherboards. Most of them hold up well but I have not seen the Intel brand do well in the performance category. I have used EVGA and ASUS with no problems. It is when you get to the lesser known brands that they generally don't last.
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I believe iptables reads your config from top to bottom so make sure you are not dropping anything before the smtp rule.
Try putting the smtp rule towards the top.
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