Override outgoing email address in Sandbox

Question

Is there a way to set a single email address to which all outgoing emails will be sent from Sandbox? Also, ensuring that no emails are sent to customers during testing?

I found this idea on IdeaExchange, but it's 7 years old and it's not yet delivered.

I tried setting a trigger on EmailMessage object that overrides the ToAddress field, however that doesn't seem to solve the problem.

Answer 1

 if([SELECT Id, IsSandbox FROM Organization LIMIT 1].IsSandbox)

    {
    Messaging.SingleEmailMessage message = new Messaging.SingleEmailMessage();
    // Set recipients to two contact IDs.
    // Replace IDs with valid record IDs in your org.
    //Create a contact with the email Id to which all the emails should be sent
    message.toAddresses = new String[] { '003D000000QDexS'};
    message.optOutPolicy = 'FILTER';
    message.subject = 'Opt Out Test Message';
    message.plainTextBody = 'This is the message body.';
    Messaging.SingleEmailMessage[] messages = 
        new List<Messaging.SingleEmailMessage> {message};
             Messaging.SendEmailResult[] results = Messaging.sendEmail(messages);
    if (results[0].success) {
        System.debug('The email was sent successfully.');
    } else {
        System.debug('The email failed to send: '
              + results[0].errors[0].message);
    }

    }

Try this.