> I don't know if its just me or whether other list members are experiencing
> the same problem but every time I post to the list I see my mail returned
> from the list then later that day I receive an undeliverable mail reply.
Yes, it has been happening to me too. As far as I remember, one of my
messages never got through to the list, but two others did. They all
generated 'undeliverable' messages from the server.