it's just example WHERE statement for the data; your query which gathers the "right" emails would be very specific to your business logic, and especially the WHERE statement which decides whether someone gets an email or not;
i just wanted to show, as an example, you don't send to every email in a table, there should be logic.
same thing for distinct email, if someone is in the table more than once, you don't want to look unprofessional by sending them multiple emails.
finally, you can see i was using a udf to make sure an email was valid...no sense trying to send to an empty string, or an email that doesn't have the @ symbol in it.
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