2012-02-02 10:01:09,081 WARN [LmtpServer] [] TcpServer/7025 - Thread pool is 105% utilized. 21 out of 20 threads inuse.
2012-02-02 10:01:09,081 ERROR [LmtpServer] [] TcpServer/7025 - cannot handle connection; thread pool xhausted
at java.util.concurrent.ThreadPoolExecutor$AbortPolic y.rejectedExecution
at java.util.concurrent.ThreadPoolExecutor.reject(Thr eadPoolExecutor.jav
at java.util.concurrent.ThreadPoolExecutor.execute(Th readPoolExecutor.ja
at com.zimbra.cs.tcpserver.TcpServer.run(TcpServer.ja va:202)
at java.lang.Thread.run(Thread.java:662)
This results in the mail queue being deferred with the message "service temporarily suspended, server refused to talk to me 421 lmtp server closing connection; service busy "
Where can the number of threads be increased or limited?