Some spam filters can be CPU and memory hogs. I recently installed
Spamassassin on an otherwise adequate mail server (admittedly pretty
ancient hardware) and found that multiple instances of Spamassassin were
virtually bringing the system to it's knees. A simple fix was to add a
lock file, so ensuring that only one Spamassassin ran at any time:
:0fw:/tmp/spamassassin.lock
| /usr/local/bin/spamassassin
Hope this may be useful to someone else.
Tim Allen
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