We found that the file based implementation did not support this load very well, so we switched to using a database (mysql) for inbox, spooler, and mailboxes, which seemed to fix the problem.
Our current problem is that the Remote Manager at times can be so slow to respond that it actually times out. This is a big problem because we have created a UI to let users create mailboxes and this UI connects to the Remote Manager. The UI stops working for long streches of time because Remote Manager is so slow, and then at other times it works fine.
The rest of the system seems to be functioning OK (although Pop3 was so slow we opted to just pull mail directly from the database, which works nicely). There is nothing in the RemoteManager or connection logs that looks suspicious. I don't think it is a problem with the database because I can run sql statements against the james user database and they all come back fairly quickly.
Any suggestions or thoughts about what to look at would be appreciated.
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