Local comes with Mailhog that captures all emails from the WordPress site. You can get an idea for how to use it when resetting the password for your user within Local:
But if you are just wanting to replace the dev email with your own within this Local site, you can do that using the “Open Site Shell” and wp-cli:
wp user list # to get the user id
wp user update 1 --user_email='the-new-email@example.com'
wp user list. # to verify that everything worked
Here’s what that looks like on my machine:
Note that this is only doing this change on the Local site, so whatever email Blocksy has, it might not be updated, you’ll likely need to reach out to them to figure out what they require.