POST - Create user - Handling +01 in email addresses

[GCsabi]

Steps to reproduce the issue:

1. Local dev environment must be running
2. From Postman send the following request to the given endpoint (password doesn't contain special character)

{
    "email": "trolol+01@test.hu",
    "password": "helloworlD1."
}

Expected Result: Successful registration

Actual Result: "message": "Invalid e-mail address"

[iujlaki]

We'd like to deny registrate with the same email address using + sign, so it's a valid scenario