Turn off the read right in other group after receving email

[q12368c]

I am using a mail server with Linux , IMAP protocol,
currently when the mail is updated (receive new mail and the mail will put in /var/spool/mail), the read-only right in the other group is reset to null,

I need to execute a command 'chown o+r mailfile' to assign read only right again. (i need to copy this file from PC for backup purpose)
How can I change the system to prevent the read only right being reset ?


The linux version:
Fedora Core release 5 (Bordeaux)
Kernel 2.6.18-1.2239.fc5 on an i686

 

[Dark Atheist]

setup a crontab

 

[q12368c]

setup a crontab

I can setup a crontab, but do anyone know how to change the settings in the mail software?