I'll double check, but I think these were Cafe members.
If so, and my message is rejected, the only thing that tells me is that possibly someone is getting too many messages, or corresponds only with certain members they know. I don't know too many people who ignore others for no reason or who wouldn't answer a simple PM; out of curiousity, if nothing else, they'd at least look at it.
And thanks Rob, I appreciate that, as always !