If you don't want to share you email on this account, , you can create a new account with a fresh email and use the account for reporting spam.
That’s unnecessary. I know some people do not want to hurt their account with forum drama so they create alt accounts to make serious accusations against other users. Reporting posts for spam or off-topic is different, only the mods can see your email and they won’t expose their reports to the next user. So there is nothing to be afraid of.