求救：sqwebmail修改密码错误

WaterH

新装的qmail+vpopmail+mysql++apache2+sqwebmail
web登录，在webmail中无法修改密码，提示：
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, postmaster@buptisc.org and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.


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察看apache2的log中的错误
[Fri Mar 19 21:52:55 2004] [error] [client 222.28.199.136] Premature end of script headers: sqwebmail, referer: http://mail.XXXX.org/cgi-bin/sqwebmail/login/test.authvchkpw/3D844167F44DF74CA16945486B12D16D/1079703897?folder=INBOX&form=preferences

我想应该是某个文件的权限不对吧。但是了几个文件，都不行。那位大哥能指教一下，修改密码用到了那几个文件，是不是文件权限的问题？
万分感谢！！