I was on Ebay's chat thing last night reporting a batch - in particular my GF which was listed yet again - down to £3000 this time
It was obviously a hacked users account because they had a few genuine, totally non-motor related items listed in addition to the 50 or so assorted classic cars and bikes.
Whilst ebay took down the listings straight away, I got the impression that it was not of any great concern to them. They certainly wouldn't confirm that they were making any attempt to trace the individual/s, nor to block any listing with an email address in the text. I found that surprising as when I sent a message to the buyer of an outboard engine that I listed, which was sold prior to that message being sent, and included my phone number to arrange collection they threatened to block my account for trying to sell outside ebay
They obviously have filters that can recognise telephone numbers etc so it should be a simple matter for their filters to pick up unusual email addresses and phrases like 'selling on behalf of a friend' which appears in them.
Steve