It is best to assume that global moderators have access to your email, and that admins has the authority to know your email even if you do not make a report.
Use a new email account, an email forwarding service, or similar. Do not use a "disposable" email account, as email resets to publicly-accessible disposable emails is a common cause of accounts getting stolen. It is also currently possible to use a fake email like
asdf@invalid.bitcointalk.org, and we may allow signing up without an email address in the future. However, if your account has never had a valid email address, then it will be extremely difficult to recover the account if it is ever stolen.