Strange problems with sendmail in RHL6.0?

[Phil Marsden <wavejump cybele orc soton ac uk>]

This one is more like a feeling than a bug report, but since upgrading to
RHL6.0 on my SX users have been experiencing strange mail problems. These
problems appear, so far, to only relate to mail being forwarded from our
Netware server. 

We are losing, wait for it, only _some_ mail and don't know why. Worked
fine on RHL5.2, but now it is not. I can't pin it down at all. There is
nothing in the maillog, when a message fails to arrive, and can't see
anything on the Netware box either - however I have yet to figure out the 
path which appears to be quite involved going through one NW box possibly 
another Linux box and maybe even a Sun before it gets to my machine. It is
as if the message has not been sent, but it was!

So my question is... has anyone else seen any problems with RHL6.0 on the
alpha? Or even the sendmail 8.9.3-10 package?

Phil.