[Exim] Frozen messages

I am getting messages frozen in the queue with the following error

failed to read delivery status for fredd@??? from delivery
subprocess
2004-05-10 16:34:16 1BNCnH-0004Fl-Mz appendfile transport process
returned non-zero status 0x0100: exit code 1

Named changed to protect the guilty of course.

However if I run exim -v -Rff bloggs it delivers them all

Any ideas

Ron

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Ron McKeating
Senior IT Services Specialist
Internet Services and Software Solutions
Loughborough University
01509 222329