Can anyone tell me what the following error might be?

thank you!

Ted Sandoval
Owner WhartonLDI
Participant Vulcan VROC list
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FROM: MAILROOM/INTERNET/POSTMASTER
TO: Thomas Gates                                               DATE: 05-31-98
                                                               TIME: 11:58
SUBJECT: Mail failure
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[005] Mail retry count exceeded sending to:
  CHANDNET  /DP1PO

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