Email isn’t instant. It is usually delayed by 30-40s, but quite often gets into the 20-30 minutes range. Hell, a few weeks ago it took 6 hours to get the login verification emails for my epic games account and couldn’t login.

Emails don’t bounce until they haven’t been able to be delivered for DAYs. With an “s,” so you won’t even know there is a delay until the message doesn’t even matter anymore.