Normalize and standardize email addresses by removing dots, tags, and converting to lowercase
Remove all dots from the username part, e.g., [email protected] → [email protected]
Remove everything after + in the username, e.g., [email protected] → [email protected]
Convert the entire email address to lowercase, e.g., [email protected] → [email protected]
Remove everything after - in the username, e.g., [email protected] → [email protected]