Invalid email is not logged in the log file

We are using custom "FROM" address for triggering email, when we are mentioning valid email address, it triggers the email properly and generates log that email is parsed. But when we try to send email to an invalid email address or just a word(e.g. abc), it still generates log that email is parsed while our expectation is, it should generate an invalid email address log or email is not delivered kind of information. Kindly Suggest

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