I made some headway in actually shutting off the spigot at the source.
Apparently, the swatchd process uses a nearly continuous tail of /var/log/zimbra.log to generate those messages. Problem is, if the /var/log/zimbra.log file is not rotated out properly (or deleted) swatchd just keeps sending and sending, ad nauseum.
Now, I don't know how to fix the log rotation problem, but clearing the /var/log/zimbra.log file in addition to the hack mentioned above seemed to work around the problem on my server. Whether this is acceptable in your environment is up to you, but consider that my server was bogged down with 450,000 messages an
hour before the workaround was applied.
Any thoughts on the log rotation problem from the Zimbra devs?
