@varun-ganesh-d that means that for at least one the unverified users, they provided an email that doesn't exist.
I have another problem all my new registered users apears like in foto:
And in logs i see this error
node_redis: Deprecated: The ZADD command contains a "undefined" argument. This is converted to a "undefined" string now and will return an error from v.3.0 on. Please handle this in your code to make sure everything works as you intended it to.
How fix it?