You could go another route with a seperate thread on the forum where usernames are not visible, but this may also get abused.
Richard! This used to be the case where people could post on the forum without registering. This caused a lot of unpleasant posts and so Mark made it obligatory to register with a “name”. It is now up to the individual whether or not they”come out” with their true identity! 😉
As the administrator, Mark can see where the mails are coming from.
Also Richard, it would be awfully unethical and against the forum rules for me to name your company but if anyone read an article in last Saturdays Telegraph Property supplement, (My pain in Spain) your company was named as the offending estate agents. It was like reading about our own experience…. verbatum…..just a different lawyer in the frame!!