[Exim] exim 3.36 error, what does it mean?

Seen it a very few times. It happens once and then everything is OK...

--
Alan Thew
FAX: +44 151 794 4442

---------- Forwarded message ----------
Date: Sun, 08 Sep 2002 02:01:00 +0100
From: exim@???

2002-09-07 06:57:53 17nTq0-00056z-00 failed to get IP address of stdin \
when \
socket passed from previous delivery: Transport endpoint is not connected