Permissions problem - can't send mails even though majordomo & sendmail are same GID

Hi,

I've installed majordomo 1.94.5 onto a yellowdog 3 (basically a ppc port of
redhat 7) system as per the INSTALL file.  Sendmail is 8.12.8 and AFAIK runs
as user smmsp.  Looking at /etc/passwd & /etc/group, smmsp belongs to group
smmsp.  I therefore set the majordomo makefile to use majordomo/smmsp as the
majordomo user & group.  Having installed majordomo, I set up a list 'test'
using the majordomo.aliases file provided with the majordomo source.  I
added the aliases file to /etc/mail, altered my .mc file & regenerated my
sendmail.cf accordingly.  I also added a symlink to the wrapper in
/etc/smrsh to allow swapper execution.  The wrapper test-config command ran
fine when executed as a normal user, with no obvious error messages.

The command 'lists' and 'info listname' work fine when sent to
test@hostname, returning info about my test mailing list.  However messages
sent to the list get returned with the following error:

The original message was received at Sun, 2 Jan 2005 21:32:02 GMT
from localhost.localdomain [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
:include:/usr/bin/majordomo-1.94.5/lists/test
    (expanded from: <[email protected]>)

   ----- Transcript of session follows -----
550 5.2.4 :include:/usr/bin/majordomo-1.94.5/lists/test... Cannot open
/usr/bin/majordomo-1.94.5/lists/test: Permission denied

The /lists/test file has permissions 640 & is owned by majordomo/smmsp.  If
I change the permissions to 644, everything works properly.  However for
security reasons I would like to use 640 permissions.  Why can the
/lists/test file not be accessed when it's permissions are 640 & both
majordomo & sendmail are running as group smmsp?

Thanks for any help!

PS As a test, I ran ps aux | grep sendmail.  I see 2 entries, only one of
which is running as user smmsp, the other as root.  Is this anything to do
with my problem?

root      7508  0.0  0.9  8200 1820 ?        S     2004   0:04 sendmail:
accepti
smmsp     7517  0.0  0.7  7344 1416 ?        S     2004   0:00 sendmail:
Queue r