You can always check netstat and see if there are odd connections coming 
in to your box. 

Do you have a SMTP gateway that sends all incoming mail to your box? If so 
that should be one of the only ones coming to yourserver...

Chris Whisonant
Comporium
Senior Mid-Range Systems Administrator
IBM eServer Certified Systems Expert - iSeries Technical Solutions V5R2
IBM Certified System Administrator - Lotus Notes and Domino 6/6.5
803.326.7270 | 803.326.6142 fax
http://cwhisonant.blogspot.com/

domino400-bounces+chris.whisonant=comporium.com@xxxxxxxxxxxx wrote on 
08/17/2005 03:15:40 PM:

> 
> 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.
> 
> Patrick
> 
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