sendmail configuration question (sharing mailboxes).

[Michael Meyer]

I have a local collection of machines (decstation 3100's running Ultrix
3.1, each with a local disk) and I would like to implement a "common"
mailbox on all of these machines.  The idea is to allow a user to log
into any machine and be able to see their mail.
At the moment I do not want to use the YP services.  

What I would like to do is have /usr/spool/mail on each machine be a
symbolic link to (say) /SERVER/usr/spool/mail where /SERVER is a NFS
mounted disk partition.   On the server machine I want to run a regular
sendmail that accepts incoming mail in the usual way.  On the client
machines I want to have a sendmail that can send out mail, but
"forwards" all incoming local mail to the server machine and also
delivers outgoing local mail to the server.  I do NOT want the client
sendmails ever dropping mail in /usr/spool/mail -- I'm sure there would
be times when two sendmails are trying to write to the same file.  
(I'm using the latest version of sendmail from berkeley; it is important
that my sendmail be able to access hosts with MX entries.)

Does anyone else do anything like this?  Does anyone have any
suggestions on what I need to do to the sendmail.cf files to implement
this.

I'd appreciate any and all advice.

Regards,
                            Michael M. Meyer
                               Statistics
                       Carnegie Mellon University.