We were discussing validation, not parsing. There’s no parsing in an email. You might give it a type once it passes validation, but an email is just a string with an @ in it (and likely some . because you want at least 1 TLD but even that I’m not sure).
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.
We were discussing validation, not parsing. There’s no parsing in an email. You might give it a type once it passes validation, but an email is just a string with an
@in it (and likely some . because you want at least 1 TLD but even that I’m not sure).