this post was submitted on 09 Feb 2024
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Programming
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You can use a regex to do basic validation. That regex is
.+@.+. Anything beyond that is a waste of time.There are also cases where you want to have a disallow list of known bad email providers. That’s also part of the parsing and validating.
It's a valid need, but a domain blacklist isn't part of email parsing and if you conflate the two inside your program then you're mixing concerns.
Why is the domain blacklist even in your program? It should be a user configurable file or a list of domains in the database.
You are right in that it isn't (or shouldn't be) part of the parsing, but the program has to check the blacklist even if it's in a database.