Validating mx record
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This question is not about how to protect against spam or validate a particular email user.
This is why when you test a domain you’ve used recently, it seems to show old information even after an update.Not reliable at all and will fail for a HUGE % of legit email.Expecting the server sending mail for a domain to also be configured to receive email for the domain is an assumption thats very likely to be incorrectly.Checking whether the MX records are set up correctly is usually the first step to do.I just added the gmail MX records in my domain, How long do I have to wait in order to start receiving mails?