I wasn't keen on that either. You could use a fake name and a "disposable" email address that will allow you to spot any subsequent emails using that address:
Search for "disposable email address". Some expire after a while and some don't.
I have got some spare Gmail addresses that I use and add something like this before the @ sign so I know if an email address used for registering somewhere has been passed on - more info here:
www.mumsnet.com/Talk/womens_rights/3691991-small-acts-of-rebellion?msgid=90134396