The article you link ends by agreeing with what I said. So I’m not exactly sure what to take it as. If your service fails because it’s trying to create and send an email to an invalid email, then you have an issue. That is not to say that you need excessive validation, but in most email libraries I’ve ever used or build you’re going to get runtime errors if you can’t provide something that looks like x@x.x which is what you want to avoid.

I guess it’s because I’m using the wrong words? English isn’t my first language, but what I mean isn’t that the email actually needs to work just that it needs to have something that is an email format.