Graphing amavis/postfix/clamav results

[Alex]

Hi,
I have a fedora14 system using postfix, amavis and clamav, and would
like to graph the data that amavis logs. I was hoping someone would
have suggestions for an application that is easy to install and
maintain, and produces graphs for mail volume, spam/ham, bayes,
messages in the queue, viruses, etc?

I had previously used mrtg and rrdtool scripts, but thought SNMP might
be something to investigate?

Ideas greatly appreciated.
Thanks,
Alex