What mean of this warning?
I found this warning every second.


Apr 29 07:02:21 mail postfix/master[17904]: warning: process /opt/zimbra/postfix-2.4.3.4z/libexec/trivial-rewrite pid 21623 exit status 1
Apr 29 07:02:21 mail postfix/smtpd[31039]: warning: problem talking to service rewrite: Success
Apr 29 07:02:21 mail postfix/master[17904]: warning: process /opt/zimbra/postfix-2.4.3.4z/libexec/trivial-rewrite pid 21622 exit status 1
Apr 29 07:02:21 mail postfix/smtpd[31042]: warning: problem talking to service rewrite: Success
Apr 29 07:02:21 mail postfix/master[17904]: warning: process /opt/zimbra/postfix-2.4.3.4z/libexec/trivial-rewrite pid 21624 exit status 1
My server is CentOS5 and version of Zimbra is 5.0.2 .