I'm seeing the same thing when I've SpamAssassin and ClamAV selected.
I've got an email address that sends the same email (hourly reports) to about 4 email address (managers's address) on the same domain. Not via forwarding in ISPconfig, just notmal To: and Cc: via smtp. And of course these emails will be received at the same time by the mail server. This's when I see a spike in the CPU (going as high as 100% usage). Top at that time shows that ClamAV and SpamAssassin is using +-25% for each of the 4 email users (web3_username)... which prompted me to ask about the performance impact on the server when SpamAssassin/Mailscan/ClamAV is activated (This Thread
). For now, I've deactivated SpamAssassin and ClamAV on all these 4 accounts because I thought it's because I'm using a develepment copy (ISPConfig-2.3.0-dev.tar.gz) until I saw this thread ...
Should I try to compile my own SpamAssassin? If I compile it, will I have upgrade issues with the next release/version of ISPConfig?
SpamAssassin version 3.1.0
running on Perl version 5.8.8
AMD Duron 1GHz with 256MB ram