I have 2 servers running Standard version.  Server 2003, 1 cpu, 4GB Ram, VM.

I've seen this several times over the past several weeks.  The spamfiltersvc service eats up all the cpu and smtp stops responding. Memory use and disk seems normal.  I usually need to hard restart.  I can't tell if it's an attack, but network use seems normal and the logs don't seem out of the ordinary in size. 

 

Any thoughts?

Can you please let us know if you're using the Bayesian filter, and if so, what is the size of the db.dat and db.dat.prb files in the \SpamFilter\Corpus directory? The Bayesian filter is the one single filter that uses up more CPU and RAM than all the others, and we often suggest to disable it. Bayesian filters where "the thing" 4 or 5 years ago, but nowdays spammers have learned how to easily bypass them.

If this issue still occurs after having disabled it, could you please zip and email us SpamFilter's activity logfile (support at logsat dot com) so we can have a look? If the file is over 8MB in size please email us so we can provide you with an FTP site to upload it (or we can download it from anywhere you'd like to place it).