Hi, all~ I've installed qmail-1.03 on RedHat 6.0. And it works well. But I have a problem in pop3. Only one user whoes account is 'hwany21' can't login through pop3 port. Others has no problem in using pop3. The following is my telnet testing. [root@mail new]# telnet localhost pop3 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. +OK <[EMAIL PROTECTED]> user hwany21 +OK pass ****** -ERR aack, child crashed Connection closed by foreign host. -ERR aack, child crashed ???? What is this error message? When do it occur? How can i currect this problem? Thank you..^^