error : -ERR aack, child crashed

[Luca Pescatore]

Hi,
        help! i get thi error : -ERR aack, child crashed

i try to connect to my POP server (vpopmail/qmailadmin) :

telnet www.domain.com 110
Escape character is '^]'.
+OK <[EMAIL PROTECTED]>
user [EMAIL PROTECTED]
+OK
pass aaaa
-ERR aack, child crashed

Connection closed by foreign host.

What's up ? How can i Fix it ?

Best Regards,
        Luca Pescatore