Apex Classes - EmailManager - email not received

Unit: https://trailhead.salesforce.com/content/learn/modules/apex_database/apex_database_intro

I completed the code, trying the instance method, and the static method. Both methods returned the info that it was successful, but I received no emails. 

Here is my static method code... 

public class EmailManager {
    // Public method
    public static void sendMail(String address, String subject, String body) {
        // Create an email message object
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
        String[] toAddresses = new String[] {address};
        mail.setToAddresses(toAddresses);
        mail.setSubject(subject);
        mail.setPlainTextBody(body);
        // Pass this email message to the built-in sendEmail method 
        // of the Messaging class
        Messaging.SendEmailResult[] results = Messaging.sendEmail(
                                 new Messaging.SingleEmailMessage[] { mail });
        // Call a helper method to inspect the returned results
        inspectResults(results);
    }
    // Helper method
    private static Boolean inspectResults(Messaging.SendEmailResult[] results) {
        Boolean sendResult = true;
        // sendEmail returns an array of result objects.
        // Iterate through the list to inspect results. 
        // In this class, the methods send only one email, 
        // so we should have only one result.
        for (Messaging.SendEmailResult res : results) {
            if (res.isSuccess()) {
                System.debug('Email sent successfully');
            }
            else {
                sendResult = false;
                System.debug('The following errors occurred: ' + res.getErrors());                 
            }
        }
        return sendResult;
    }
}

Here is the Execute Window:

EmailManager.sendMail('***@zohomail.com', 'Trailhead Tutorial', '123 body');

Here is a snippet of the Debug Only log result..

It is not in the spam folder. 

The deliverability test works - I receive that email.

I checked settings somewhere on the deliverability - they were okay. 

Ideas??

Thanks

Gary Pryzner