From time to time, and increasingly frequently at this time of year, my dear wife has to send out emails to big segments of her company's customer base. That's her job, after all. However, for reasons that are outside the scope of this blog, the list of customers doesn't always have an email for each customer and, for various other reasons, the email addresses are not always well-formed. It takes her several hours each time to go through the list and manually screen them all.