I do not believe that a spammer is the problem... we have had SMTP set to "no relay" and no one can set up accounts for themselves via webmail.
We have very few users (>500) and still will max out CPU. Usually webmail is the one hogging the CPU.
We have been searching but have not found any...
We have been having the same problem and it is driving us nuts.
I have applied all the patches and hotfixes to no avail. We even increased RAM on the machine for some help.
If anyone out there has resolved this... It would be appreciated to know how.
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