May 29 23:46:49.213 2006 [91415] (v4.0.8) POP login by user "hogehoge" at (xxx.xx.xx.xx) xxx.xx.xx.xx May 29 23:46:50.812 2006 [91415] I/O error flushing output to client hogehoge at xxx.xx.xx.xx [xxx.xx.xx.xx]: Operation not permitted (1) May 29 23:46:50.812 2006 [91415] hogehoge at xxx.xx.xx.xx (xxx.xx.xx.xx): -ERR SIGHUP or SIGPIPE flagged May 29 23:46:50.812 2006 [91415] I/O error flushing out