Hi
I am running DU3.2d on a AlphaServer 8400 with sendmail 8.7.5.  We have
recently migrated the /var/spool/mail from advfs to ufs because of
performance problem with advfs.  We have about 40,000 mailbox in the
/var/spool/mail directory.  
Recently, we are experiencing bounce mail from sendmail about "Too many
users" error message which is shown below.
Does anyone has experience this message from sendmail ?  How can we solve
this problem ?
Thank you in advance.
---------- Forwarded message ----------
Date: Fri, 28 Jun 1996 00:24:45 +0800 (SST)
From: Mail Delivery Subsystem <MAILER-DAEMON_at_singnet.com.sg>
To: postmaster_at_merlion.singnet.com.sg
Subject: Returned mail: Service unavailable
The original message was received at Fri, 28 Jun 1996 00:24:45 +0800 (SST)
from localhost
   ----- The following addresses have delivery notifications -----
<dmjjlims_at_singnet.com.sg>  (unrecoverable error)
   ----- Transcript of session follows -----
binmail: opening /usr/spool/mail/dmjjlims -: Too many users
Mail saved in dead.letter
554 <dmjjlims_at_singnet.com.sg>... Service unavailable
Received on Fri Jun 28 1996 - 08:41:11 NZST