I'm trying to set up a new email to our future new users, but I can't seem to work out how to make that rule. I don't want our existing users to get this email, only future users.

video1.0<iframe src="https://www.loom.com/embed/6b75b283e34b4b6a95df58809d6c792e" frameborder="0" width="1152" height="864" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>8641152Loomhttps://www.loom.com8641152https://cdn.loom.com/sessions/thumbnails/6b75b283e34b4b6a95df58809d6c792e-00001.gif42I'm trying to set up a new email to our future new users, but I can't seem to work out how to make that rule. I don't want our existing users to get this email, only future users.