[cobalt-users] Raq4 strange behavior

[Milum Software <shayes@xxxxxxxxxxxxxxxxx>]

I have a raq4r with 512MB and just a few minutes ago the web server and 
email server stopped working, I could log in with telnet and could see 
errors in the maillog like (removed the users and server names) :

Aug  6 14:16:19 raq sendmail[21716]: g76JDdB21716: SYSERR: putoutmsg 
(list.offic
er.com): error on output channel sending "250 2.1.5 <xxxx@xxxxxxxxxxxxx>.
.. Recipient ok (will queue)": Broken pipe
Aug  6 14:16:19 raq sendmail[21716]: g76JDdB21716: lost input channel from 
list.
officer.com [xxx.xxx.xxx.xxx] (may be forged) to MTA after rcpt
Aug  6 14:16:19 raq sendmail[21716]: g76JDdB21716: from=<xxxx@xxxxxxxxxxx
>, size=7168, class=0, nrcpts=0, proto=ESMTP, daemon=MTA, 
relay=list.officer.com [xxx.xxx.xxx.xxx] (may be forged)
Aug  6 14:17:05 raq sendmail[21756]: g76JEOB21756: SYSERR: putoutmsg 
(list.officer.com): error on output channel sending "250 2.1.5 
<xxxx@xxxxxxxxxxxxx>.
.. Recipient ok (will queue)": Broken pipe
Aug  6 14:17:05 raq sendmail[21756]: g76JEOB21756: lost input channel from 
list.

After reboot all came up fine however when I telnet in the system seems 
flaky when I try to log in as su the system also is doing one other thing, 
when I do a "tail -f /var/log/maillog" I get the current log info but then 
I'm put back to the command line. Before the server had this problem I 
could use the "tail -f /var/log/maillog" to watch the mail log. Any one 
seen this before?

Any help would be great.

Scott