Two things: anti-spam and per-process *network* I/O.

[Neil Schelly]

On Dec 26, 2012 12:15 PM, "Ken D'Ambrosio" <ken at jots.org> wrote:
> Per-process I/O accounting.  Every now and then, I see a system load
> spike through the roof -- but disk I/O is okay, likewise CPU.  Which
> really pretty much leaves network.  But I'm unaware of any tool that
> spits out per-process network utilization statistics.  One *must* exist,
> right?  Any pointers?

I can't help on the mail front, as I sold out to Gmail years ago now.
However, iftop and iotop sound like tools that may help with your load
troubleshooting.  Think of them like being the equivalent of top, but for
block and network device I/O instead of CPU and memory utilization.
-N
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