maillog里的提示：
Jul 27 18:26:38 wap postfix/local[24657]: warning: connect #2 to subsystem private//usr/libexec/postfix/lmtp: No such file or directory
Jul 27 18:26:48 wap postfix/local[24657]: warning: connect #3 to subsystem private//usr/libexec/postfix/lmtp: No such file or directory
Jul 27 18:26:56 wap dovecot: SIGHUP received - reloading configuration
Jul 27 18:26:58 wap postfix/local[24657]: warning: connect #4 to subsystem private//usr/libexec/postfix/lmtp: No such file or directory
Jul 27 18:27:05 wap dovecot: Killed with signal 15
Jul 27 18:27:05 wap dovecot: Dovecot starting up
Jul 27 18:27:08 wap postfix/local[24657]: warning: connect #5 to subsystem private//usr/libexec/postfix/lmtp: No such file or directory
Jul 27 18:27:18 wap postfix/local[24657]: warning: connect #6 to subsystem private//usr/libexec/postfix/lmtp: No such file or directory
Jul 27 18:27:28 wap postfix/local[24657]: warning: connect #7 to subsystem private//usr/libexec/postfix/lmtp: No such file or directory
Jul 27 18:27:38 wap postfix/local[24657]: warning: connect #8 to subsystem private//usr/libexec/postfix/lmtp: No such file or directory
Jul 27 18:27:48 wap postfix/local[24657]: warning: connect #9 to subsystem private//usr/libexec/postfix/lmtp: No such file or directory
Jul 27 18:27:58 wap postfix/local[24657]: warning: connect #10 to subsystem private//usr/libexec/postfix/lmtp: No such file or directory
Jul 27 18:28:08 wap postfix/local[24657]: fatal: connect #11 to subsystem private//usr/libexec/postfix/lmtp: No such file or directory
Jul 27 18:28:09 wap postfix/nqmgr[7930]: warning: premature end-of-input from private/local socket while reading input attribute name
Jul 27 18:28:09 wap postfix/nqmgr[7930]: warning: private/local socket: malformed response
Jul 27 18:28:09 wap postfix/nqmgr[7930]: warning: transport local failure -- see a previous warning/fatal/panic logfile record for the problem description
Jul 27 18:28:09 wap postfix/master[7928]: warning: process /usr/libexec/postfix/local pid 24657 exit status 1
Jul 27 18:28:09 wap postfix/master[7928]: warning: /usr/libexec/postfix/local: bad command startup -- throttling