Troubleshooting

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I get "Bad username / password" messages but I entered it correctly!

Check /usr/sbin/login_validate. It should be:
-r-sr-xr-x   1 root     root        5364 Apr  9 11:38 /usr/sbin/login_validate
(the size may differ depending on your architecture)

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I get garbage displayed in my browser when I try to use nwebmail!

If you get something like:
ELF   ?gi_rewind_F blah blah blah

then your web server does not recognise nwebmail as a CGI script. This
may be because your cgi-bin is not configured as a CGI directory. Another
quick thing to try is to rename nwebmail as nwebmail.cgi, and try using that.
Refer to your web server documentation for details.

For Apache, the cgi-bin directory is configured like this:
<Directory "/home/httpd/cgi-bin">
 Options ExecCGI
</Directory>

ScriptAlias /cgi-bin/ "/usr/local/apache/cgi-bin/"


nwebmail.cgi should work if you have the line:
AddHandler cgi-script .cgi