It is not "stupid", it is simple and effective. I use the blacklist process to exclude disposable email domains (there are 100s of them and everyday new ones co

It is not "stupid", it is simple and effective. I use the blacklist process to exclude disposable email domains (there are 100s of them and everyday new ones come up) from registering on my service. It is much faster and inexpensive than making a round trip API call to some remote service to confirm validity of the email domain. Unless you don't have better things to do with your time, I will suggest focusing your time on things that are more important.