Non-matching records in T-SQL One-to-Many Relations

I was recently tasked with finding all the people in our CRM software that lack email addresses, and with around 3000 contacts, there was no way I was going to do it by hand. SQL to the rescue!
There was just one issue, email addresses are stored in a different table to allow each person to have multiple addresses on file. After a bit of digging around, I came up with this:

Let’s go through this line-by-line so we can see exactly what it does.

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