I do have very occasional trouble with my email hosting with invalid bouncing, but I did get 2 out of 3 of the emails. I've spoken with tech support multiple times, and it appears that its caused by either cosmic rays or not being current on bribes to the silicon gods... or mostly likely some SPF record conflicts.

Thanks again for your efforts, its been illuminating to find out the various gotchas with charts & VBA, and quite a relief too.

All's well that ends well.

Warm regards,
bart13