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Path: utzoo!decvax!microsof!uw-beaver!cornell!vax135!ariel!houti!hogpc!houxm!hocda!spanky!burl!we13!mgweed!rjk
From: rjk@mgweed.UUCP
Newsgroups: net.mail,net.unix-wizards
Subject: Re: Mail Security and Locking Problem
Message-ID: <257@mgweed.UUCP>
Date: Thu, 26-May-83 07:19:14 EDT
Article-I.D.: mgweed.257
Posted: Thu May 26 07:19:14 1983
Date-Received: Sat, 28-May-83 16:25:34 EDT
Lines: 34

The following secure mailing scheme works great for us:

Actual transcript of what happens as user "rjk":
-------------------------------------------------------
$ ls -ld /usr/mail
drwxrwx--x   2 bin      mail         960 May 26 09:05 /usr/mail

$ ls -l /usr/mail/rjk
-rw-rw----   1 rjk      mail         417 May 26 09:05 /usr/mail/rjk

$ cat /usr/mail/rjk
>From jfs Thu May 26 09:04:22 1983
To: rjk
Subject: cu
...

$ ls -l /usr/mail/adm
-rw-rw----   1 adm      mail         825 Mar 22 15:30 /usr/mail/adm

$ cat /usr/mail/adm
cat: cannot open /usr/mail/adm

$ ls -l /usr/mail
/usr/mail unreadable
total 2

$ grep MFMODE /usr/src/cmd/mail.c
#define	MFMODE		0660		/* create mode for `/usr/mail' files */
--------------------------------------------------------

No one can read anyone else's mail and the locking mechanism works as it
is supposed to.
							Randy King
							we13!mgweed!rjk