Problem with Fedora1 and ipop3d

[Tim Alberts]

When I setup my system to have POP3 access to email, it seems to run for a 
short period of time (many times once) and then I no longer get email from 
the server.

Running sendmail, procmail, spamassassin ipop3d (included with fedora imap 
package) and installed clamav.

What I've discovered is that the /var/spool/mail/user file gets overwritten 
with the following text:

>From MAILER-DAEMON Thu Apr 22 11:50:17 2004
Date: 22 Apr 2004 11:50:17 -0700
From: Mail System Internal Data <MAILER-DAEMON at localhost.localdomain>
Subject: DON'T DELETE THIS MESSAGE -- FOLDER INTERNAL DATA
Message-ID: <1082659817 at localhost.localdomain>
X-IMAP: 1082659816 0000000002
Status: RO

This text is part of the internal format of your mail folder, and is not
a real message.  It is created automatically by the mail system software.
If deleted, important folder data will be lost, and it will be re-created
with the data reset to initial values.

I found in the /var/log/maillog the following lines:

Mailbox Vulnerable - Directory /var/spool/mail must have 1777 protection

Does anyone know what's going on?