Thanks for the advice. I appreciate it greatly.
I have been watching the amavisd tmp directory located in /opt/zimbra/data/amavisd/tmp. However, I have yet to see it go above 3MB. I have a script checking it every 15 seconds.
How much RAM disk do I need to devote to this directory?
I am thinking it does not need to be much. Should it be sized by the maximum file attachment size? Does that matter?