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Why is there a difference between SendGrid’s Email API and Validation API?

How should I orient myself to which addresses I can send emails or not.
Since there is a difference to what Email API and Validation API considered a valid email. If I try to send an email via the Email API to “_mãrîa+∑пост@gmail.com” It will tell me: “We don’t support non-ASCII characters”, but at the same time if I send request to the validation API with the same email it will refer to it as a valid email? I am a bit confused, I would really appreciate your help on that matter, thanks in advanced!