Domino 6.5.4 server on iSeries V5R2

The last couple of days we are seeing SMTP process spikes that are pushing
the CPU to 98%+.  SMTP task was at 86% for quite a while yesterday.  So
far, the only thing I've had any luck with is ending the SMTP task and
restarting it.  We are not seeing any indications of what might be causing
this, but I'm not sure I know what to look for.

Since I've been watching, I've seen the process spike briefly several
times, but generally not long enough to cause the entire server to grind to
a halt like it did yesterday.  My boss is concerned that this is the result
of some sort of attack on our system.

Any suggestions would be much appreciated.


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