this post was submitted on 16 Jun 2023
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There really isn't a reliable way to "validate" email addresses other than to try sending email to them.
An email address has two parts, separated by the @ sign: the "local part" and the domain. The domain has to follow the rules of DNS, but there are astonishingly few hard rules for the local part.
A validator can check that the domain resolves โ that there's an
AorMXrecord for it in DNS โ but it can't do much about the part before the @ sign.Whether the local part is correct or not depends on the actual behavior of the mail server for the domain; which means that, without actually trying to send email to it, it can't really be tested.