User Activity

I have a potential buyer who keeps sending me the same email about various items. They never buy anything. I know I can block bidders but he/she never bids on anything. Is there a way I can stop them from sending me messages apart from contacting Eba...
When I log into my computer, it takes me straight to Overview. I had my old phone set up similarly but can't work out how to do it on my new phone. Could anyone help me with this, please? I can't find anything about it on the forums. Probably too thi...