Warning: could not send message for past 4 hours

[Mail Delivery Subsystem <MAILER-DAEMON@metalab.unc.edu>]

    **********************************************
    **      THIS IS A WARNING MESSAGE ONLY      **
    **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **
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The original message was received at Tue, 22 Oct 2002 09:30:00 -0400
from ldp-ann@localhost

   ----- The following addresses had transient non-fatal errors -----
ldp-ann
    (expanded from: ldp-ann)

   ----- Transcript of session follows -----
ldp-ann... Deferred: Name server: industrial.metalab.unc.edu: host name lookup failure
Warning: message still undelivered after 4 hours
Will keep trying until message is 5 days old
Reporting-MTA: dns; tribal.metalab.unc.edu
Arrival-Date: Tue, 22 Oct 2002 09:30:00 -0400

Final-Recipient: RFC822; ldp-ann@tribal.metalab.unc.edu
X-Actual-Recipient: RFC822; ldp-ann@industrial.metalab.unc.edu
Action: delayed
Status: 4.2.0
Remote-MTA: DNS; industrial.metalab.unc.edu
Last-Attempt-Date: Tue, 22 Oct 2002 13:30:49 -0400
Will-Retry-Until: Sun, 27 Oct 2002 08:30:00 -0400

--- Begin Message ---

• To: ldp-ann
• Subject: Cron <ldp-ann@tribal> /export/sunsite/users/ldp-ann/bin/ldpaddem >> /export/sunsite/users/ldp-ann/ldpaddem.out 2>&1
• From: root (Cron Daemon)
• Date: Tue, 22 Oct 2002 09:30:00 -0400

/bin/sh: /export/sunsite/users/ldp-ann/ldpaddem.out: No such file or directory

--- End Message ---